Vlan based default gateway

Alteon Web OS allows you to assign different default gateways for each VLAN. You can effectively map multiple customers to specific gateways on a single switch.
do cisco load balancers support different default gateway for each vlan?

one way of doing it today would be to define a serverfarm for each gateway, and have a vserver match_all for every vlan.
For example,
serverfarm gateway_1
no nat client
no nat server
real
x.x.x.x
serverfarm gateway_2
<...>
vserver gateway_vlan1
virtual 0.0.0.0 /0 any
serverfarm gateway_1
vlan
vserver gateway_vlan2
virtual 0.0.0.0 /0 any
serverfarm gateway_2
vlan

Similar Messages

Sudden Ping Drop from Default Gateway in VLAN

Hi,
We have a Layer3 Switch 3560 and we have configure multiple VLANs along with SVI on it. We have then cascade layer2 Switches (Cisco 2960) with 3560 by Trunk links. Now we are facing problem on one VLAN that users are in specific VLAN sudden get ping drop from their default gateway (SVI on Cisco 3560) and this problem is not come with all users in that VLAN as just few users in a single time face this problem. When we unplug the systems for few second and reconnect then problem get resolved for few minutes till hours.
Kindly guide me to resolved this.
Regards,
Arshad

I have also clean the arp cache on users systems by using "'netsh interface ipv4 delete arpcache" but in vain. Now i have perform the below steps and operation is working fine since last 20 hours approx.
1- Change the First Casade Switch Cisco 2960.
2- Remove EtherChannel and Change the Backbone port on Cisco 3560 and Cisco 2960.
3- Connect both switches with single backbone Gig Port.
4- IOS Version on previous Cisco 2960 switch was IOS 12.2(50)SE3 and the IOS Version on newly installed switch is IOS 12.2(50)SE5

Cascading RV180 as DHCP server but pointing to another default gateway router

Hi,
My network topology is as follows:
Internet <-> Residential Gateway (RG) from ISP (OEM: Pace) [192.168.1.254/255.255.255.0] <-> RV180 [192.168.1.253/255.255.255.0] <-> SG500 switch [192.168.1.250/255.255.255.0] <-> rest of network.
I know this is a cascading LAN-to-LAN arrangement. The cable from the RG to the RV180 is from a LAN port on the RG to a LAN (not WAN) port on the RV180.
I eventually want to segment my network into a few VLANs from the RV180 down. I am aware most people would recommend DHCP on the "primary" router, but the RG is non-VLAN aware, so I figure I need to handle the DHCP off the RV180. At the same time, I have also opted not to do a LAN-to-WAN cascade because I want to retain the ability to configure the RG from the rest of the network and not have to cart a computer over to the RG to do it.
On the RG, I've disabled DHCP, and placed 192.168.1.253 in the DMZ.
On the RV180, I've enabled DHCP and put it in Router mode.
The issue is that I do not have any Internet connectivity. If I allow the computers in the network to receive IP addresses over DHCP, the default gateway that is communicated is 192.168.1.253, which is the RV180. If I configure static IPv4 information on my computers to point to 192.168.1.254, I am able to connect outside, as you would expect.
How can I get the RV180 to pass out DHCP IP addresses, but point to 192.168.1.254 as the default gateway? I thought the solution might be to create a default route (or something). I went to the static routes tab but it wouldn't let me enter 0.0.0.0 as a destination IP to route through 192.168.1.254.
Further down the line, is it possible for both the RG and the RV180 to connect directly to the SG500, along with the other nodes in my network? That way the RV180 only serves to maintain the VLANs and pass out IP addresses via DHCP, instead of having it be the choke through which everything goes through on the way out?
Sorry if there is a really obvious solution to this. It's really been floundering about in the dark so would appreciate any advice

Hi Jason, I have considered your post here for quite some time. I came to one conclusion based off your text. The entire purpose of the RV180 is a DHCP server for multiple subnet / vlan.
Here's the thing, you have a SG500 switch. Based off reading your text, this will do everything the RV180 can except the DHCP service. The limitation you are going to run in to is still going to be your gateway unit, the RG.
In the end, even with such a configuration using the RV!80 or the SG500 (layer 3), the RG will have to be configured with static routes since the RG has no concept of those other LAN segments.
Here is a post I wrote about a SG300 connecting to a RV0XX router (which doesn't understand the VLANs)
https://supportforums.cisco.com/message/3739083#3739083
Using the concept of this topic, you may be able to add aditional static routes on the RV180 sending each subnet to the common IP interface of the RG.
It would be very interesting to see if we could make that work.
-Tom
Please rate helpful posts

Procurve - Default Gateway Issue

Help Help Help
2 Weeks on this is still doing my head in, i have a procurve 3800 with multiple vlans and we are looking at testing some new internet filtering that sits inline, so i have created a new interface on my firewall and put the new filter inline.
I have changed the default route on my core to the new firewall ip, and was really looking forward to having a good play.
I have also changed the default gateway to the new interface too, however when i run a traceroute on the core its still going to our old default gateway.
Anyone got any idea what else to check?
This topic first appeared in the Spiceworks Community

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Default gateway arp lookup failed

Hi there
On a 5500 series WLC I see I have an issue where peap clients get randomly disconnected with these errors
MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:444 Max EAPOL-key M1 retransmissions exceeded for client 24:77:03:35:79:34
AAA-6-ARP_LOOKUP_FAIL: radius_db.c:3232 Default gateway arp lookup failed.
aaaQueueReader: Aug 31 19:12:14.938: %AAA-4-RADIUSMSG_SEND_FAILED: radius_db.c:3567 Unable to send RADIUS message to
Any ideas?
Thanks
Naresh
Sent from Cisco Technical Support iPhone App

(Cisco Controller) >show wlan 1
WLAN Identifier.................................. 1
Profile Name..................................... SSID1
Network Name (SSID).............................. SSID1
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Enabled
Network Admission Control
Radius-NAC State............................... Disabled
SNMP-NAC State................................. Disabled
Quarantine VLAN................................ 0
Maximum number of Associated Clients............. 0
Number of Active Clients......................... 0
Exclusionlist Timeout............................ 60 seconds
Session Timeout.................................. 1800 seconds
CHD per WLAN..................................... Enabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ i_wifi
Multicast Interface.............................. Not Configured
WLAN ACL......................................... unconfigured
DHCP Server...................................... Default
DHCP Address Assignment Required................. Enabled
Static IP client tunneling....................... Disabled
Quality of Service............................... Silver (best effort)
Scan Defer Priority.............................. 4,5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
WMM UAPSD Compliant Client Support............... Disabled
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
IPv6 Support..................................... Disabled
Passive Client Feature........................... Disabled
Peer-to-Peer Blocking Action..................... Drop
Radio Policy..................................... All
DTIM period for 802.11a radio.................... 1
DTIM period for 802.11b radio.................... 1
Radius Servers
   Authentication................................ 1.1.1.1 1812
   Authentication................................ 1.2.1.1 1812
   Accounting.................................... 1.1.1.1 1813
   Accounting.................................... 1.2.1.1 1813
   Dynamic Interface............................. Enabled
Local EAP Authentication......................... Disabled
Security
   802.11 Authentication:........................ Open System
   Static WEP Keys............................... Disabled
   802.1X........................................ Disabled
   Wi-Fi Protected Access (WPA/WPA2)............. Enabled
      WPA (SSN IE)............................... Disabled
      WPA2 (RSN IE).............................. Enabled
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Enabled
      Auth Key Management
         802.1x.................................. Enabled
         PSK..................................... Disabled
         CCKM.................................... Enabled
         FT(802.11r)............................. Disabled
         FT-PSK(802.11r)......................... Disabled
FT Reassociation Timeout......................... 20
FT Over-The-Air mode............................. Enabled
FT Over-The-Ds mode.............................. Enabled
CCKM tsf Tolerance............................... 1000
   CKIP ......................................... Disabled
   Web Based Authentication...................... Disabled
   Web-Passthrough............................... Disabled
   Conditional Web Redirect...................... Disabled
   Splash-Page Web Redirect...................... Disabled
   Auto Anchor................................... Disabled
   H-REAP Local Switching........................ Disabled
   H-REAP Local Authentication................... Disabled
   H-REAP Learn IP Address....................... Enabled
   Client MFP.................................... Optional
   Tkip MIC Countermeasure Hold-down Timer....... 60
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
SIP CAC Fail Send-486-Busy Policy................ Enabled
SIP CAC Fail Send Dis-Association Policy......... Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled
Mobility Anchor List
WLAN ID     IP Address            Status

Multiple vLans with Multiple Gateways

HI.
Got a SF500 in layer3 mode, operating 5 vlans all with their own subnet.
Vlan 10 = 192.168.10.0/24
Vlan 100 = 192.168.100.0/24
Vlan 200 = 192.168.200.0/24
Vlan 201 = 192.168.201.0/24
Vlan 202 = 192.168.202.0/24
We have a gateway on Vlan 10 (192.168.10.1), which all vlans can see & access (because of intervlan routing), and this at present allows vlan 10 to access the internet.
I want vlan 100 to be able to access the internet through this gateway as well, although the other vlans (200,201,202), will use a different gateway located on vlan 200 subnet.
Of course, the gateway has to exist in the subnet. I cannot assign the default gateway of a machine on vlan 100, an ip address of the gateway on vlan 10.
If I point the default gateway to the virtual interface in its subnet (e.g. 192.168.100.254), it equally does not know how to get out to the internet, even though it can see the gateway (I can access a web page it hosts).
So the question is this:
Can vlan 100 traffic be routed on the SF500 to use the gateway on vlan 10? (outside of the default gateway of the switch).
If this is not possible with the SF500, what would I need to make it work?
Many thanks.

Hi Andrew,
I don't have more information about your network so I will try to much your configuration from your post
let's say we have this configuration :
1. Create Vlan 10 and assign on SVI IP address 192.168.10.254 /24
2. Create Vlan 100 and assign on SVI ip address 192.168.100.254/24
3. Create Vlan 200 and assign on SVI ip address 192.168.200.254/24
4. Create Vlan 201 and assign on SVI IP address 192.168.201.254/24
5. Create Vlan 202 and assign on SVI IP address 192.168.202.254/24
and the gateway (Router) is on Vlan 10 with IP address 192.168.10.1
6. we assign at least one port to each vlan and the switch port from where is connected to the router should be trunk (10U,100T,200T,201T,202T) it means All the traffic from Vlan 100,200,201,202 is Tagged and transmitting through Untagged Vlan 10
7. Under IP Cofiguration --> IPv4 Management and Interface --> IPv4 Route
8. add the deafult static route to the gateway :
Destination : 0.0.0.0
SubnetMask : 0.0.0.0
Remote IP GW :192.168.10.1
Now from the router expectation : router need to NAT all the source IP address (200.0/24 , 100.0/24 ...)
I don't know what the router you have but there is a router where NAT all the source coming to him to go to Internet, but there is other router which need to configure NAT for the unknown address for the router side --> Here is up to the Router
after that connect PC to port on Vlan 100 setup static IP for example 192.168.100.100/24 with Gw 192.168.100.254 should access to the internet via the trunk port on the switch and router should NAT this subnet to go outside
Hope I was clear
Please rate this post or marked as answered to help other Cisco Routers
Greetings
Mehdi

Default Gateway when connected to VPN

Thanks for reading!
This is probably a dump question so bear with me...
I have set up a VPN connection with a Cisco ASA 5505 fronting internet, with the customers environment behind it (on the same subnet), When connected ot the VPN I can reach the inside Router fronting me and one switch behind the Router (every switch is connected to the router), but nothing else.
My beet is that the Router is messing with my connection, but,, nevermind that!, the setup ain't complete anyway... my question is more related to the Gateway I'm missing when I'm, from the outside, is connected to the VPN on the ASA, could this mess it up? Shouldn't I have a Standard-Gateway in the ipconfig settings in windows?
This is who it looks like now:
        Anslutningsspecifika DNS-suffix . : VPNOFFICE
        IP-adress . . . . . . . . . . . . : 10.10.10.1
        Nätmask . . . . . . . . . . . . . : 255.255.255.0
        Standard-gateway . . . . . . . . :
The internal network is :
172.16.12.0 255.255.255.0
Below is my config for the ASA, thanks a lot!!!!!!!
!FlASH PÅ ROUTERN FRÅN BÖRJAN
!asa841-k8.bin
hostname DRAKENSBERG
domain-name default.domain.invalid
enable password XXXXXXX
names
interface Vlan1
nameif inside
security-level 100
ip address 172.16.12.4 255.255.255.0
interface Vlan10
nameif outside
security-level 0
ip address 97.XX.XX.20 255.255.255.248
interface Ethernet0/0
switchport access vlan 10
interface Ethernet0/1
interface Ethernet0/2
interface Ethernet0/3
interface Ethernet0/4
interface Ethernet0/5
interface Ethernet0/6
interface Ethernet0/7
ftp mode passive
clock timezone CEST 1
clock summer-time CEDT recurring last Sun Mar 2:00 last Sun Oct 3:00
dns server-group DefaultDNS
domain-name default.domain.invalid
object-group protocol TCPUDP
protocol-object udp
protocol-object tcp
access-list nonat extended permit ip 172.16.12.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list MSS_EXCEEDED_ACL extended permit tcp any any
access-list VPN-SPLIT-TUNNEL remark VPN SPLIT TUNNEL
access-list VPN-SPLIT-TUNNEL standard permit 172.16.12.0 255.255.255.0
tcp-map MSS-MAP
exceed-mss allow
pager lines 24
logging enable
logging timestamp
logging buffer-size 8192
logging console notifications
logging buffered notifications
logging asdm notifications
mtu inside 1500
mtu outside 1500
ip local pool VPN 10.10.10.1-10.10.10.40 mask 255.255.255.0
icmp unreachable rate-limit 1 burst-size 1
icmp permit any inside
icmp permit any outside
asdm image disk0:/asdm-625-53.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list nonat
nat (inside) 1 172.16.12.0 255.255.255.0
route outside 0.0.0.0 0.0.0.0 97.XX.XX.17 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
aaa authentication ssh console LOCAL
http server enable
http 172.16.12.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs group1
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto isakmp policy 65535
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh 172.16.12.0 255.255.255.0 inside
ssh timeout 5
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
group-policy VPNOFFICE internal
group-policy VPNOFFICE attributes
dns-server value 215.122.145.18
vpn-tunnel-protocol IPSec
split-tunnel-policy tunnelspecified
split-tunnel-network-list value VPN-SPLIT-TUNNEL
default-domain value VPNOFFICE
split-dns value 215.122.145.18
msie-proxy method no-proxy
username admin password XXXXXX privilege 15
username Daniel password XXXXX privilege 0
username Daniel attributes
vpn-group-policy VPNOFFICE
tunnel-group VPNOFFICE type remote-access
tunnel-group VPNOFFICE general-attributes
address-pool VPN
default-group-policy VPNOFFICE
tunnel-group VPNOFFICE ipsec-attributes
pre-shared-key XXXXXXXXXX
class-map MSS_EXCEEDED_MAP
match access-list MSS_EXCEEDED_ACL
class-map inspection_default
match default-inspection-traffic
policy-map type inspect dns preset_dns_map
parameters
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect sip
inspect xdmcp
inspect icmp error
inspect pptp
inspect ipsec-pass-thru
inspect icmp
class MSS_EXCEEDED_MAP
set connection advanced-options MSS-MAP
service-policy global_policy global
privilege cmd level 3 mode exec command perfmon
privilege cmd level 3 mode exec command ping
privilege cmd level 3 mode exec command who
privilege cmd level 3 mode exec command logging
privilege cmd level 3 mode exec command failover
privilege cmd level 3 mode exec command packet-tracer
privilege show level 5 mode exec command import
privilege show level 5 mode exec command running-config
privilege show level 3 mode exec command reload
privilege show level 3 mode exec command mode
privilege show level 3 mode exec command firewall
privilege show level 3 mode exec command asp
privilege show level 3 mode exec command cpu
privilege show level 3 mode exec command interface
privilege show level 3 mode exec command clock
privilege show level 3 mode exec command dns-hosts
privilege show level 3 mode exec command access-list
privilege show level 3 mode exec command logging
privilege show level 3 mode exec command vlan
privilege show level 3 mode exec command ip
privilege show level 3 mode exec command ipv6
privilege show level 3 mode exec command failover
privilege show level 3 mode exec command asdm
privilege show level 3 mode exec command arp
privilege show level 3 mode exec command route
privilege show level 3 mode exec command ospf
privilege show level 3 mode exec command aaa-server
privilege show level 3 mode exec command aaa
privilege show level 3 mode exec command eigrp
privilege show level 3 mode exec command crypto
privilege show level 3 mode exec command vpn-sessiondb
privilege show level 3 mode exec command ssh
privilege show level 3 mode exec command dhcpd
privilege show level 3 mode exec command vpnclient
privilege show level 3 mode exec command vpn
privilege show level 3 mode exec command blocks
privilege show level 3 mode exec command wccp
privilege show level 3 mode exec command webvpn
privilege show level 3 mode exec command module
privilege show level 3 mode exec command uauth
privilege show level 3 mode exec command compression
privilege show level 3 mode configure command interface
privilege show level 3 mode configure command clock
privilege show level 3 mode configure command access-list
privilege show level 3 mode configure command logging
privilege show level 3 mode configure command ip
privilege show level 3 mode configure command failover
privilege show level 5 mode configure command asdm
privilege show level 3 mode configure command arp
privilege show level 3 mode configure command route
privilege show level 3 mode configure command aaa-server
privilege show level 3 mode configure command aaa
privilege show level 3 mode configure command crypto
privilege show level 3 mode configure command ssh
privilege show level 3 mode configure command dhcpd
privilege show level 5 mode configure command privilege
privilege clear level 3 mode exec command dns-hosts
privilege clear level 3 mode exec command logging
privilege clear level 3 mode exec command arp
privilege clear level 3 mode exec command aaa-server
privilege clear level 3 mode exec command crypto
privilege cmd level 3 mode configure command failover
privilege clear level 3 mode configure command logging
privilege clear level 3 mode configure command arp
privilege clear level 3 mode configure command crypto
privilege clear level 3 mode configure command aaa-server
prompt hostname context
Cryptochecksum:aaa1f198bf3fbf223719e7920273dc2e
: end

I didn't realise I had that crypto settings on, thanks my bad!!!
But... the 172.16.12.0 network is directly connected, the Router (that to be honest is a firewall) / switches is all on the same subnet (172.16.12.X/24), so sorry I didn't explain thoroughly, was more wondering about the GW and didn't want to overcomplicate things..
The Firewall/Router dosen't do any routing, so it should work right (I you count out the firewalling in the firewall and so forth, there shouldn't be any problems accomplishing this with the ASA)? The Firewall is more a DHCP for the clients/Firwall for the clients.. this will change in the future.. it will be removed,
the vpn network is staticly routed back to my ASA in that firewall...
I don't like this solution.. but this is who it looks.. for now..
(VPN network is 10.10.10.X/24)
But... shouldn't I see a default gateway under ipconfig when I'm connected to the VPN from internet, on the vpn client that's vpned in, is this correct?
THANKS for all the help!

VRF , Management access only and default gateway

Hello
I am preparing (3) new devices to become my new WAN. The topology looks like,
                 ASR1002x - Has management int and dg for remote access.
                                     Also has DG to WAN ISP via BGP
                 3750x stack - Has management int and dg for remote access. (ip vrf management 0.0.0.0 0.0.0.0 (Management vlan hsrp ip))
                                       Also has DG to ASR hsrp - which causes the Management access to drop.
                 ASA5545x - Has management int and dg for remote access.
                                      Also has DG to ASR hsrp - which causes the Management access to drop.
I MUST KEEP THESE NEW DEVICES OFF THE PRODUCTION NETWORK TO AVOID ANY POSSIBLE ROUTING ISSUES.
I have implemented unique EIGRP instances between the new devices.
These new devices have a management interface so I can access them remotely. I configured the default gateway pointing to the HSRP of the management Vlan and I have remote access.
Obviously I cannot have (2) default gateways out different interfaces, without assigning one with higher admin.
What should my management default gateway look like so I can have remote access to the device and still have the WAN/LAN routing work as needed??

found another thread with some suggestions, maybe it helps at the moment.
http://forums.lenovo.com/lnv/board/message?board.id=Special_Interest_Utilities&thread.id=6000

Best practice to change default gateway for HA-CAM

Hi,
The next week end, i will have a downtime to change it's HA-CAM's default gateway.
My question is, how can i do that?.
This change is not synchronized if i change only from an active cam (service Ip) o it does?
I was thinking on stops services for standby cam, then connect to a service ip, change its default gateway to active cam, then stops services and start them for standby cam and so on...
This is correct or this idea is wrong?
Please, I need suggestions.
Thanks for advance.

Kaylan
If the user vlan is routed on a L3 device before going to either the MPLS router or the firewall you could use PBR on the L3 device (if supported).
But as Reza says, we need more info on your network layout.
Jon

Host with same IP of default gateway. How to prevent?

Hi,
I had a problem this week in the network. A host was plugged in the network with the same IP address of the default gateway of that Vlan.
Is there someway to prevent it? I know with 802.11x I could know who is doing that, but it would not avoid the problem to occur.
Is there anyway to force the hosts to use DHCP or something?

Hey there. You want to look at DHCP snooping ;-) Make sure you have a DHCP server configured, and DHCP snooping enabled on your switch. If a device tries to use any static assigned IP addresses, the switch interface will block it (it must be DHCP assigned). For your router interface, make sure you trust the interface (as you will have a static IP address assigned).
Hope this helps, good luck
Dazzler

How get the RVS4000's DHCP server to assign another IP address other than its own as the default gateway to its DHCP clients?

Hi,
I have a RVS4000 router with DHCP enabled and in router mode.
The LAN is 192.168.2.x. The RVS4000 static IP address is 192.168.2.8
The router is not the RVS4000 and is at 192.168.2.1
The RVS4000 dhcp is assigning it's clients a default gateway of 192.168.2.8 instead of what I want 192.168.2.1.
How can I get the RVS4000's DHCP server to assign another IP address other than its own as the default gateway to its DHCP clients?
Thanks

Hi Gail, you cannot do this. The router, as the DHCP server will only assign a default gateway of what IP interface the DHCP server runs on. If you have the default IP, the gateway is 192.168.1.1. If you create a second vlan, by default it would be 192.168.2.1.
There are not configuration options for the built-in DHCP server. If you'd like to expand this functionality, you would need an external dhcp server.
-Tom
Please mark answered for helpful posts

Default Gateway address for multiple VPN users/clients

Hello,
We need some help with a VPN setup for a school project.
What we want to do:
We would like to have aprox. 10 different VPN uses that can connect to our Windows Server 2012 R2 which is setup as a VPN server, by the Role called Remote access. And the VPN server is working and we are able to connect to it from another location/computer.
Our current setup:
We have a Cisco router, that are configured with 10 Vlans, from Vlan 10 to Vlan 20, and a managament Vlan called Vlan 100.
The Cisco router is also acting as DHCP server, so inside each Vlan the DHCP gives IP addresses to that specific Vlan, Ex: Vlan 10 has a 192.168.10.0/24 network. Vlan 11 has a 192.168.11.0/24 network, and so on. Vlan 100 has 192.168.100.0/24 This Vlan 100
has connection to all the Vlans.
We have internet connection on the Router on port 0 and each Vlan are connected to the internet.
We have setup the VPN server with a static IP configuration so it is inside Vlan 100 with a Default gateway, like 192.168.100.1 So the VPN server is connected to the internet.
In AD we have created a User and assigned a static IP address in the user properties, under the Dial-In tab. Here we give this user this IP 192.168.10.225
Now when we connect to the VPN server useing this user, we have no connection to any of the Vlans (ping) and no internet. When we in cmd write ipconfig we can see that our VPN connection has this IP 192.168.10.225 but a Subnet called 255.255.255.255 and
a Default gateway called 0.0.0.0
We would like the user to recieve the correct IP settings like: If we connect with our user, it should recieve the IP as it does, but also a subnet called 255.255.255.0 and a default gateway called 192.168.10.1
How is this achieved?
The reason we want this is: We want to create a VPN user for each Vlan. So a user with permission to access Vlan 10 but are not able to see the other Vlans, and then a new user to access Vlan 11 but not able to see the other vlans, and so on.
Hope someone is able to help us to understand how this is done.
Thank you in advance.

Hi,
In brief, we can't achieve this. Normally, we would not do this.
Usually, we use firewall or ACL to restrict the remote users.
For example, 192.168.10.100 is assigned to user1 and 192.168.10.101 is assigned to user2. We can use firewall to restrict 192.168.10.100 to access 192.168.10.0/24 and 192.168.10.101 to access 192.168.11.0/24.
Best Regards.
Steven Lee Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Duplicate IP on a default gateway interface = Bad

I just had an entire VLAN drop out due to a host being brought onto the network that had been erroneously configured with a static IP that happened to be in conflict with the HSRP default gateway IP of the core switch; fortunately, we were able to remove the offending host and reconfigure default gateways as a workaround until the core switch's ARP table updated.
Is there any way to configure a 6500 running IOS to inhibit or block a conflicting IP (especially one with a gateway IP) by using a static ARP entry or other authoritative command?
Thanks,
Marc

Hi,
You may use the following.
enable Unicast Reverse Path Forwarding on an interface. Unicast RPF guards against IP spoofing (a packet uses an incorrect source IP address to obscure its true source) by ensuring that all packets have a source IP address that matches the correct source interface according to the routing table.
Normally, the FWSM only looks at the destination address when determining where to forward the packet. Unicast RPF instructs the FWSM to also look at the source address; this is why it is called Reverse Path Forwarding. For any traffic that you want to allow through the FWSM, the FWSM routing table must include a route back to the source address. See RFC 2267 for more information.
For outside traffic, for example, the FWSM can use the default route to satisfy the Unicast RPF protection. If traffic enters from an outside interface, and the source address is not known to the routing table, the FWSM uses the default route to correctly identify the outside interface as the source interface.
If traffic enters the outside interface from an address that is known to the routing table, but is associated with the inside interface, then the FWSM drops the packet. Similarly, if traffic enters the inside interface from an unknown source address, the FWSM drops the packet because the matching route (the default route) indicates the outside interface.
Unicast RPF is implemented as follows:
?ICMP packets have no session, so each packet is checked.
?UDP and TCP have sessions, so the initial packet requires a reverse route lookup. Subsequent packets arriving during the session are checked using an existing state maintained as part of the session. Non-initial packets are checked to ensure they arrived on the same interface used by the initial packet.
To enable Unicast RPF, enter the following command:
hostname(config)# ip verify reverse-path interface interface_name
http://www.cisco.com/en/US/products/hw/switches/ps708/products_module_configuration_guide_chapter09186a0080577c66.html#wp1042625
It may be useful..
Rgrds
Rajeev.S

Setting Default Gateway on O

I have a LAG with two VLANs in it.
Setup
VLAN 1 (Untaged default) is connected to the '192.168.11.x', which connects to the "10.1.10.x", which connects to the internet.
VLAN 3 (Tagged) is connected directly to "10.1.10.x" which connects to the internet.
Situation;
When both VLAN3 and VLAN1 are up, default gateway is 192.168.11.1
When VLAN1 is down, default gateway is 10.1.10.1
*Desired configuration;*
How do I make the VLAN3 interface the default, or the directly attached network of 10.1.10.x the default, when it is enabled?
I have tried this, but must be missing something;
+kevin-cossaboons-mac-pro:~ kevincossaboon$ sudo route -nv add -net 0.0.0.0 10.1.10.1+
Password:
+u: inet 0.0.0.0; u: inet 10.1.10.1; RTM_ADD: Add Route: len 128, pid: 0, seq 1, errno 0, flags:<UP,GATEWAY,STATIC>+
+locks: inits:+
+sockaddrs: <DST,GATEWAY,NETMASK>+
+default 10.1.10.1 default+
+route: writing to routing socket: File exists+
+add net 0.0.0.0: gateway 10.1.10.1: File exists+
+kevin-cossaboons-mac-pro:~ kevincossaboon$ netstat -r+
+Routing tables+
Internet:
+Destination Gateway Flags Refs Use Netif Expire+
+default 192.168.11.1 UGSc 30 171 bond0+
+10.1.10/24 link#13 UCS 3 0 vlan0+
+10.1.10.1 0.13.f7.af.e7.e6 UHLW 0 93 vlan0 995+
+10.1.10.13 0.18.39.3b.42.95 UHLW 0 26 vlan0 178+

In your network preferences click the cog wheel and choose set service order. Then drag vlan3 to the top of the list.

Setting default gateway in subnetted network

I have a /24 that i have been using as 2 x/25. Recently i was asked to subnet the network into 1x /27, 3x /28 and 1x /30. Previously I just had one default gateway. Now how will I set the default gateway for all these subnets?

Hi ,
Yes if you want to route the traffic between subnets ,then you need gateway to defined on your network elements (router /L3 switches) .
After breaking into number of subnets , ensure you have created appropriate vlan on layer 2 switch if applicable , Switch port access accrodingly .
Use Subnet calculator
https://www.cisco.com/cgi-bin/Support/IpSubnet/home.pl
HTH
sandy

Vlan based default gateway

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