CE-7305 and natting
Does the CE require a static nat entry on the edge router in order to function properly?
Yes, a Static NAT entry is needed for the CE to function. NAT uses timers on each translation entry to remove entries that are no
longer being used. The timer mechanism being used turns out to dramatically increase CPU utilization for large numbers of NAT translation entries.
Similar Messages
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Cisco ASA Site to Site IPSEC VPN and NAT question
Hi Folks,
I have a question regarding both Site to Site IPSEC VPN and NAT. Basically what I want to achieve is to do the following:
ASA2 is at HQ and ASA1 is a remote site. I have no problem setting up a static static Site to Site IPSEC VPN between sites. Hosts residing at 10.1.0.0/16 are able to communicate with hosts at 192.168.1.0/24, but what i want is to setup NAT with IPSEC VPN so that host at 10.1.0.0/16 will communicate with hosts at 192.168.1.0/24 with translated addresses
Just an example:
Host N2 (10.1.0.1/16) will communicate with host N1 192.168.1.5 with destination lets say 10.23.1.5 not 192.168.1.5 (Notice the last octet should be the same in this case .5)
The same translation for the rest of the communication (Host N2 pings host N3 destination ip 10.23.1.6 not 192.168.1.6. again last octet is the same)
It sounds a bit confusing for me but i have seen this type of setup before when I worked for managed service provider where we had connection to our clients (Site to Site Ipsec VPN with NAT, not sure how it was setup)
Basically we were communicating with client hosts over site to site VPN but their real addresses were hidden and we were using translated address as mentioned above 10.23.1.0/24 instead of (real) 192.168.1.0/24, last octet should be the same.
Appreciate if someone can shed some light on it.Hi,
Ok so were going with the older NAT configuration format
To me it seems you could do the following:
Configure the ASA1 with Static Policy NAT
access-list L2LVPN-POLICYNAT permit ip 192.168.1.0 255.255.255.0 10.1.0.0 255.255.0.0
static (inside,outside) 10.23.1.0 access-list L2LVPN-POLICYNAT
Because the above is a Static Policy NAT it means that the translation will only be done when the destination network is 10.1.0.0/16
If you for example have a basic PAT configuration for inside -> outside traffic, the above NAT configuration and the actual PAT configuration wont interfere with eachother
On ASA2 side you can normally configure NAT0 / NAT Exemption for the 10.1.0.0/16 network
access-list INSIDE-NONAT remark L2LVPN NONAT
access-list INSIDE-NONAT permit ip 10.1.0.0 255.255.0.0 10.23.1.0 255.255.255.0
nat (inside) 0 access-list INSIDE-NONAT
You will have to take into consideration that your access-list defining the L2L-VPN encrypted traffic must reflect the new NAT network
ASA1: access-list L2LVPN-ENCRYPTIONDOMAIN permit ip 10.23.1.0 255.255.255.0 10.1.0.0 255.255.0.0
ASA2: access-list L2LVPN-ENCRYPTIONDOMAIN permit ip 10.1.0.0 255.255.0.0 10.23.1.0 255.255.255.0
I could test this setup tomorrow at work but let me know if it works out.
Please rate if it was helpful
- Jouni -
ASA5505 SOHO public ip range and nat head ache
Hello
Can anyone shed some ligh on a problem im having. We have setup a ASA 5505 with an ISP called Zen that allocates you a subnet of public ip addresses. i have sucessfully setup the asa to access the internet using nat on the outside interface. we would like to use the other ip addresses in the range for other services but i cannot think how i can do this/configure this.
LAN > ASA5505 > VDSL Modem > ISP
the range they have given us is
Number of IP addresses: 8
IP addresses: XX.XX.XXX.40 - XX.XX.XXX.47
Subnet mask: 255.255.255.248
Subnet in slash notation: XX.XX.XXX.40 /29
Network address: XX.XX.XXX.40
XX.XX.XXX.41
XX.XX.XXX.42
XX.XX.XXX.43
XX.XX.XXX.44
XX.XX.XXX.45
XX.XX.XXX.46 Router
Broadcast address: XX.XX.XXX.47
Router address: XX.XX.XXX.46
i have setup XX.XX.XXX.46 on the otside interface and hosts inside can access the net and nat from the internet to internal devices all work.
we have a vdsl modem connected to the outside interface and using PPPoE we dynamically get the XX.XX.XXX.46/32 address.
Is there any way i can use the other spare addresses? i do see how i can use them. i have done a lot of browsing and the only way i see that other people have been able to do this is using a layer3 device and using ip unnumber of the external int point to a loopback,
any info or advice would be gratefully received.
regards
C.Hello
the version is Cisco Adaptive Security Appliance Software Version 9.2(2)4
debugging icmp i see pings to the .46 address however i see no pings/traffic received on the asa for the other addresses. how does zen know to route the xx.xx.xx.41 to .45 ip addresses to the firewall using the .46 address?
the nat rules i have are
nat (Vlan200_Int,Outside_Dirty_Int) dynamic interface < this works for lan access to the internet
nat (Vlan200_Int,Outside_Dirty_Int) static xx.xx.xx.45 no-proxy-arp service tcp www 65100
nat (Vlan200_Int,Outside_Dirty_Int) static xx.xx.xx.45 no-proxy-arp service tcp https 65101
access-list Outside_Dirty_Network_access_in extended permit tcp object Click_PC object ESXi object-group DM_INLINE_TCP_7
object-group service DM_INLINE_TCP_7 tcp
port-object eq 902
port-object eq www
port-object eq https
thanks for the help -
Internal DNS server and NAT routing issue.
Hi -- I am not terribly experienced with DNS and I am running into an issue that I can't seem to resolve. My company.com DNS information is hosted by an outside ISP for email, web, etc... but I have configured an A record there to point to the public IP to my mac os x server (server.company.com).
We have a cisco router configured with one to one NAT from the public IP to the internal IP for our server in a 192.168.15.x subnet. The same router is running DHCP and and NAT on that subnet under a different public IP provided by our ISP.
Our server is running DNS with recursion and has a "company.private" zone set up for internal services and machine names. Thus, the server is accessible via "server.company.com" from the outside and "server.company.private" from the private LAN.
The problem is that I would like to be able to access some services simply via "server.company.com" both inside and outside the private network. Now, accessing the "server.company.com" services from the private lan does not work because the name resolves to the external IP and the external IP cannot be used internally due to NAT.
Is there a way to configure my internal DNS server to respond with the appropriate private address when receiving a query only to "server.company.com" and forward requests on for anything else on "company.com"?
I know that I could manually duplicate all entries for our domain from my ISP and host the same entries for internal clients, but it would be much easier to only have our server handle requests for itself. The server is running OS X Server 10.4.11.
ThanksIs there a way to configure my internal DNS server to respond with the appropriate private address when receiving a query only to "server.company.com" and forward requests on for anything else on "company.com"?
Ordinarily, no. Once your server thinks it is responsible for a zone (e.g. company.com) then it will answer all queries for that domain and never pass them upstream. Therefore you'd have to replicate all the zone data, including all the public records, and maintain them both.
The one possible exception to this (I haven't tried) is to create a zone for server.company.com that has your internal address. In theory (like I said, I haven't tried this), the server should respond to 'server.company.com' lookups with its own zone data and defer all other lookups (including other company.com names since they're not in a zone it controls). Might be worth trying. -
Apple Airport Extreme Base Station for PPPoE, DHCP and NAT with ActionTec DSL modem
I just spent several hours trying to track down proper instructions for setting up my Apple AEBS to do the PPPoE, DHCP and NAT while connected to an ActionTec M1000 (no wireless module). It turns out my initial set ups on both devices were correct, but that the order for rebooting and reconnecting the two devices is critical. All of the threads I found on this forum and on many others suggested this was not possible, but it is. What I don't yet know is whether it is the best method for running my home network DSL connection to my ISP (CenturyLink).
The instructions I found that worked come courtesy of Brandon Konkle's blog and are both simple and clear: http://brandon.konkle.us/post/19637529637/centurylink-actiontec-q1000-airport-ex treme-bridge
The proper settings for the ActionTec DSL Modem can be found under Advanced Setup/IP Adressing/WAN IP Address
Click RFC 1483 Transparent Bridging then click on Apply.
(see also http://qwest.centurylink.com/internethelp/modems/m1000/pdf/M1000_BRIDGE.pdf )
To reduce time, do this BEFORE you reset your AEBS then set the AEBS so that you don't have to wait for the AEBS to reboot.
In contrast to what Brandon described for the Q1000 modem, my AEBS never reconnected to the modem (he describes his as getting an IP from his ISP, then dropping it then getting another over and over - mine never got an IP). Once you have reset both devices as described, the critical steps I have not found described elsewhere were:
1. Disconnect the power from both the modem and the Airport Extreme.
2. Disconnect the Ethernet cable between the two devices
3. Restore power to the 2 devices and allow them to fully reboot. For the ActionTec M1000, this is indicated when the lights stop blinking. (Note that the Internet light will NOT be lit in this instance since the modem is acting only as a bridge. You will NOT have an Internet connection until the AEBS is reconnected.) The AEBS will be blinking yellow.
4. Reconnect the Ethernet cable between the devices (make sure on the M1000 that you are using the connector with the circle icon over it, not the arrow icon).
Within about 60 seconds, the AEBS light went to steady green and the connection to the Internet was restored.
Now I have to see if this is a more stable configuration than the flaky one I had before while using the AEBS as a bridge and the M1000 to do everything.
Does anyone think or know if it will make a difference?
Message was edited by: Bud ShawNow I have to see if this is a more stable configuration than the flaky one I had before while using the AEBS as a bridge and the M1000 to do everything.
Does anyone think or know if it will make a difference?
No one can accurately predict in advance what the actual results might be. I've tried both ways with different products and cannot say that one method is better than the other. What works is best.
In theory, it is preferable to have the modem provide the PPPoE connection service since it is the device connected directly to the Internet.
In practice, results vary depending on the service provider, products used, phase of the moon, alignment of the planets, etc. -
How to set up DHCP and NAT for QNAP NAS MyCloud service?
I have an Apple AirPort Extreme Base Station (AEBS) attached to my DSL model (no router in the modem). My QNAP NAS is attached via ethernet to the QNAP NAS. My iMac (running AirPort Utility 6.x) is connected to the AEBS via wifi.
I've found several folks who've tried this (and apparently succeeded) but I'm a networking novice and am having trouble making this work. What I did was to go into the AirPort utility and in the networking section configure "DHCP and NAT" and then called out the static IP and MAC address of the QNAP NAS (as well as the ports I'd like to remain open). However, when I did this and applied the changes, my iMac (connected to the AEBS via wifi) could no longer see the AEBS, which then required me to reset the AEBS, re-configure it back to the previous known good conifiguration and start over. After about 5 cycles of this I gave up.
So, what am I doing wrong here? Do I need to go in and configure every device that is going to access the AEBS as static and call out each device's IP and MAC address? (hopefully not, that'd be a major PITA).
Help. Anyone?When I run diagnostics with the QNAP, here is the reply I get (IPs redacted):
------ NAT PMP Diagnostics ------
initnatpmp() returned 0 (SUCCESS)
using gateway : xx.x.x.x
sendpublicaddressrequest returned 2 (SUCCESS)
readnatpmpresponseorretry returned 0 (OK)
Public IP address : 192.168.xxx.xxx
epoch = 2621
closenatpmp() returned 0 (SUCCESS)
------ UPnP Diagnostics ------
upnpc : miniupnpc library test client. (c) 2006-2011 Thomas Bernard
Go to http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
for more information.
List of UPNP devices found on the network :
desc: http://xx.x.x.x:60606/8CC1212D0C6D/Server0/ddd
st: upnp:rootdevice
desc: http://xx.x.x.x:9000/TMSDeviceDescription.xml
st: upnp:rootdevice
desc: http://xx.x.x.xx:55000/nrc/ddd.xml
st: upnp:rootdevice
desc: http://xx.x.x.xx:55000/dmr/ddd.xml
st: upnp:rootdevice
desc: http://xx.x.x.xx:49152/4/description.xml
st: upnp:rootdevice
desc: http://xx.x.x.xx:49152/2/description.xml
st: upnp:rootdevice
desc: http://xx.x.x.xx:49152/0/description.xml
st: upnp:rootdevice
desc: http://xx.x.x.xxx:8200/rootDesc.xml
st: upnp:rootdevice
desc: http://xx.x.x.xxx:49152/gatedesc.xml
st: upnp:rootdevice
desc: http://xx.x.x.xxx:49153/gatedesc.xml
st: upnp:rootdevice
desc: http://xx.x.x.xxx:49155/gatedesc.xml
st: upnp:rootdevice
desc: http://xx.x.x.xxx:9000/TMSDeviceDescription.xml
st: upnp:rootdevice
UPnP device found. Is it an IGD ? : http://xx.x.x.x:60606/
Trying to continue anyway
Local LAN ip address : xx.x.x.xxx
GetConnectionTypeInfo failed.
Status : , uptime=3217870016s, LastConnectionError :
Time started : Wed Mar 13 17:04:03 1912
MaxBitRateDown : 7 bps MaxBitRateUp 0 bps
GetExternalIPAddress() returned -3
GetExternalIPAddress failed.
GetGenericPortMappingEntry() returned -3 ((null)) -
Problem with passive mode FTP server and NAT
Hi,
I have a problem with Passive mode FTP and NAT.
I am trying to run both an FTP server and sharing the Internet connection via NAT. I have by the way specified the passive ports to use in ftpaccess (65000-65534). Everything works fine until someone tries to connect via Passive mode. I have tracked the problem down to the firewall and the rule that handles NAT.
Firewall rule config without NAT:
00001 allow udp from any 626 to any dst-port 626
01000 allow ip from any to any via lo0
12300 allow ip from any to any
65535 allow ip from any to any
Firewall rule config with NAT
00001 allow udp from any 626 to any dst-port 626
00010 divert 8668 ip from any to any via en1
01000 allow ip from any to any via lo0
12300 allow ip from any to any
65535 allow ip from any to any
So, passive ports do not work when NAT is on. If I turn it off, Passive ftp works like a charm.
But how do I solve my problem? I have in my quest for the answer stumbled upon "-punch_fw" but do not know how to use it or if it even helps me at all?
Best regards,
Peter
B&W G3 Mac OS X (10.4.5)Media/Lacrosse-1-tiny.3gp
I can't find the file on your server.
They may also need to edit the .htaccess file to allow the .3gp file extension be used. Call them. -
Guest Public Network behind 10.4 Server running DHCP and NAT
I am wondering if it is possible to use APE's guest networking capabilities while still using OS 10.4 server and my DHCP and NAT servers? Is there a way to set the Airport to run its own DHCP NAT and have everything routed correctly?
Or do I still need to use two separate Airports in order to have a public and private network at my home.I figured it out. I just deiced to run a double NAT configuration
-
DCHP and NAT, or off (Bridge-Mode)?
If I want to connect my MacBook and iPod touch to the internet using the AirPort Express, do I need to set router mode to DCHP and NAT, or off (Bridge-Mode)? I can't seem to get them both happily connected at once. My iPod especially doesn't like being connected now that I played with the settings to get rid of the long-standing flashing amber status.
After I turn it on each time, I need to have my laptop on and open up Safari, before the iPod touch will connect.
Normally, you want to power-up the modem first. Let it initialize for about 10 minutes. Then plug-in your AirPort Express. Give it a couple of minutes to initialize as well. Then power-up any of the other wireless clients.
I need to have my laptop on and open up Safari, before the iPod touch will connect. Otherwise it comes up with a pop-window saying "Authentication required" asking for a username and password, or sometimes it'll say "your password will be sent in the clear" (something like that).
Is your ISP providing you with DSL or ADSL service? These typically require that you first enter your user credentials (username & password) prior to gaining Internet access. If this is the case you will want to configure the AirPort Express to do this for you so you don't have to enter them via the PC. -
I would like to change the ike and NAT-T port from UDP 500 and 4500 to 505 and 4505
Is it possible to do that. This is because i already port forward udp 500 and 4500 to another router (Router B)
This router B will setup a VPN to remote site.click settings on the phone, click store, click Apple ID: [email protected], select sign out, then sign in with the new ID
-
CSS 11500 url path rewrite and NAT
Hi,
We are evaluating a CSS 11500 and try to configure url path rewrite and NAT, but we have some problems.
What we would like to do is the following:
http://www.example.com/path1 -> http://host1:80
http://www.example.com/path2 -> http://host1:8080
http://www.example.com/path3 -> http://host2:80
The address www.example.com is resolving to a valid internet address, whereas host1 and host2 resolves to private IP addresses.
The client should always see the external url (e.g. http://www.example.com/path1/...) and the CSS should do the necessary translation.
Any help would be very much appreciated!
Regards,
HaraldHello Experts, I'm new with this cisco stuff too(just got it 3 weeks ago), but here is some of my experience with cisco css 11501.
First : Service ServerName, there is a port setting here, but from my experience, I think it is related with KeepAlive option, so, port is alternate way to know if the server alive or not.
Second : When you send request to cisco css, the port option in content port will be the cisco css port to accept request, so, if you send a request to http://vip:8080/, all service must be in the same port too to balance the request, in this case, port 8080, if one service port 80, i'm sure the css will not hit the server.
Third : To solve your problem...
http://www.example.com/path1 -> http://host1:80 (ipA)
http://www.example.com/path2 -> http://host1:80 (ipB)
http://www.example.com/path3 -> http://host2:80
if you are lazy to buy new nic, just set subinterface/ip alias on the host1, and make the webserver only bind to specific address, not to all interface...
O yea, about your path1/path2/path3 -> /, hmm, i'm still asking in this forum about path changing cause until now, i haven't know how to do this, i know about apache rewrite module, and success do this, if only i know about this in cisco css too :-(
I'm sorry if I make mistake, I'm just telling my experience... -
Does the stock firmware for the new E2500 allow DHCP and NAT to be disabled so that the router can act as an access point?
You can disable the DHCP server.
You can disable NAT. But there is no need to do so. -
Loosing internet when in DHCP and NAT mode
Hello and thank you for your help. I am a novice.
I am using a 2009 macbook pro 10.7.5 with Mountain Lion
Originally my airport extreme setup was for " DHCP and NAT ".
Since yesterday, I am only able to get internet via Bridge mode, but I have to sign in to my server network first, like a hotspot
This means that my internet timing is limited and the finder shows other personal computers that does not belong to my personal network. My iphone cannot connect to my personal network without signing in the internet service provider website first as well
What happens when I try to update and restart AE to DHCP and NAT, is that I loose internet and get the following message in the airport extreme icon :
"DOUBLE NAT:
This airport base station has a private IP address on its Ethernet WAN port.
It is connected to a device or network that is using NAT to provide IP addresses.
Change your Airport base station from using DHCO and NAT to bridge mode."
Now, I do not want bridge mode
My attempt to solve the problem was resetting AE to factory. This created a new network. The new network appears in the network icon and it is WPA2 personal protected, like the previous one.
I appreciate your time and look foreward to solve my problem with some help in here - thank you againOriginally my airport extreme setup was for " DHCP and NAT ".
If it was, and you had a modem/router or gateway type of device "upstream" on the network, then you created a Double NAT error on the network.
Sometimes, you can get away with this on a simple network, and AirPort Utility does provide the option to "ignore" the error on the network, so the AirPort Extreme will display a green status light.....instead of blinking amber, which signals that something is amiss.
"DOUBLE NAT:
This airport base station has a private IP address on its Ethernet WAN port.
It is connected to a device or network that is using NAT to provide IP addresses.
Change your Airport base station from using DHCO and NAT to bridge mode."
If you want to run in DHCP and NAT mode, you will have a Double NAT error on the network. Click the option to "ignore" the error.
Then, power cycle the entire network. That means powering everything off, waiting a minute, then starting the modem first and let it run a minute or two, then start the next device the same way. Keep starting devices one at a time about a minute apart until the entire network is back up. -
Setting up DNS on Xserve when DHCP and Nat ae controlled by windows machine
Trying to set up an Intel based Xserve on an internal network to have 6 other G5's authenticate to. But I am having problems setting up DNS.
This server is being added to a windows network that has DHCP and NAT handled by a different windows machine. I have also assigned the xserve with a static IP address of 192.168.1.XXX Now this server is just going to run a few programs for the 6 macs in the art department. Software Update, Version Cue, Suitcase Server. I have version cue and suitcase server up and running. But I would also like to have the macs authenticate to the server for the updates.
If I type in hostname at terminal I get:
localhost.xserve
and when I type in host 192.168.1.XXX
I get some error about no name aviable or something...
How can I setup simple dns just for the server? Would there be any down falls for having DNS setup on this machine when it is conected to a windowws network?
Please help. Sorry for the long winded explination.Yes, it's possible. Although I'm no longer favorable towards fake "domains" like .lan or the like.
Besides which (and most people don't know) ".lan" is actually an existant TLD. So it's not so great either.
Set the server to what it's FQDN should be, and set it to answer to & for itself only.
Is everything else internally using ".lan" ? If not you're going to have to point clients to your server strictly by IP alone and while that's fine, this setup is starting to sound just ugly, if not somewhat Frankenstein-ian
But to limit requests you'll have to edit /etc/named.conf by hand.
Google can lead you to the information, there's plenty out there - here's one for example:
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/ref-guide/s1-bind-namedcon f.html -
Cisco 1841 with 2 public WAN IP's and NAT
OK currently the network is setup as follows:
Zyxel SHDSL Router --> Linksys Router --> 10/100 Switch --> PC's
x.x.x.145/28__________x.x.x.146/28____________________192.168.1.0/24
The Linksys router is running inbound one-to-many PAT (eg. x.x.x.146:80 --> 192.168.1.10:8080)
I'm looking to replace the setup with a Cisco 1841 router. Now normally I would configure the DSL interface as unnumbered to the internal LAN interface and use my public IP addys on this segment then passing through a PIX to NAT into private IP addys.
The problem I have is I want the 1841 to be an all in one box performing DSL, Firewall and NAT functions.
Now I thought I would configure the DSL as unnumbered to FastEthernet0/0 adding a secondary IP address of x.x.x.146/28. Interface configured as NAT outside.
Interface FastEthernet0/1 was configured with 192.168.1.1/24 with NAT inside and connected to the switch.
The problem was is that the FastEthernet0/0 interface line protocol was down as there was no need to connect it to anything.
I then tried assigning the dialer interface a static IP of x.x.x.145/28 and x.x.x.146/28 as a secondary IP running NAT outside. I tried again but during boot up the router said you cant assign a secondary IP to the dialer interface.
So my question is, how would you recommend setting up the interfaces to enable the router to have both x.x.x.145 and 146/28 as public IP's and NAT x.x.x.146:80 to 192.168.1.10:8080?
Any help much appreciated.Answers:
1) DSL is terminating in the 1841 on a SHDSL WIC
2) No
3) IP is negotiated
4) Below is a config which I believe should work. Any recommended amendments?
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname trackgw
boot-start-marker
boot-end-marker
no aaa new-model
resource policy
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef
no ip dhcp use vrf connected
username cisco privilege 15 secret xxx
controller DSL 0/0/0
mode atm
line-term cpe
dsl-mode SHDSL symmetric annex B
line-rate AUTO
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip nat inside
duplex auto
speed auto
interface FastEthernet0/1
no ip address
duplex auto
speed auto
interface ATM0/0/0
no atm ilmi-keepalive
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
interface Dialer1
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
encapsulation ppp
no cdp enable
ppp authentication chap callin
ppp chap hostname username
ppp chap password 0 password
ppp ipcp dns request
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
ip http server
ip http authentication local
ip nat inside source list nat-acl interface Dialer1 overload
ip nat inside source static tcp 192.168.1.10 8080 x.x.x.146 80
ip access-list extended nat-acl
permit ip 192.168.1.0 0.0.0.255 any
dialer-list 1 protocol ip permit
no cdp run
control-plane
line con 0
logging synchronous
login local
transport output all
line aux 0
transport output all
line vty 0 4
privilege level 15
login local
transport input telnet
scheduler max-task-time 5000
end
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