ASA receiving two default routes to internet via OSPF
I am trying to test something for a client. If I have an ASA that receives two default routes to the internet via OSPF, will it load balance those connections? I have a feeling the answer is 'no.' If that is the case, would the ASA would be at least able use the second internet connection if the primary one becomes saturated?
TIA,
Dan
Yes, I know that the ASA cannot have default routes on multiple interfaces. Both of the default routes are coming into the ASA's outside interface. There would be two routers and the ASA in area 0 for OSPF. The routers would have the default-information originate command in their OSPF configuration to push the default route out to the ASA.
Similar Messages
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Can I use two default route in a router
Hi
I have a router which have two isp line.
I want connected two differnt remote site by two isp line.
now i have one default and another static.
i can use two default route like this ?
0.0.0.0 0.0.0.0 201.222.103.x 0
0.0.0.0 0.0.0.0 201.221.102.y 1
Thanks
[email protected]hi
I feel you wanted to know if you have 2 default routes already in place and about the impact if you put network specific routes.
In this case you can have both the default routes in place in addition to the network specific static routes as i mentioned in my first mail.
Since the most specific route will be used the traffic destined to your remote networks will flow accordingly as per your ip route statements.
If your first link goes down the default route pointing the ISP-1 and the network sepcific route pointing the ISP-1 will go off and by default all the traffic will flow via the second interface which is connected to ISP-2 the behaviour is viceversa if your link to ISP-2 goes down.
By this you will be atleast having some kinda reachability in case of any issues with the corresponding ISPs which is being used to reach the remote network than getting totally disconnected from the remote sites.
regds -
Hi,
I have a question concerning EIGRP routing on a L3 switch behind a HSRP HA pair of routers which connect to a WAN.
HSRP is operating as should be and when R1 fails, or an interface thereon, R2 becomes the active. All good.
However there are now two default routes in the route table on the L3 switch. One is routing traffic to the R2 real IP which is expected but also there is the old default route to R1's real IP.
Using EEM we can overcome this but is there another simpler method to prevent this occurring?
Thanks
FF
If i understand correcty your LAN interfaces on the routers ie. the ones connecting to the L3 switch are running HSRP and you are also running EIGRP between the L3 switch and the routers.
If so you wouldn't usually have both solutions in use ie. you either -
1) use HSRP and point the default route on the L3 switch to the HSRP VIP
or
2) use EIGRP between the routers and the L3 switch. If a router or interface fails it should stop advertising the default route to the L3 switch.
However that sounds like it is not happening which suggests the default routes are not coming from the WAN.
So where are the default routes in EIGRP on the L3 switch coming from ?
Jon -
DMVPN Default routes (over internet and over tunnel)
Hello all,
I want to implement a DMVPN (using OSPF) solution in which all routers are connected to the internet and all of then have dynamic IP addresses (except hub). Because of this each router have a default gateway pointing to the ISP IP address.
With this solution I want a spoke to skope topology and I also want all customer internet traffic to go via central site. The problem is that I need a defaut route to reach other spokes and this way traffic to internet via central site does not use the tunnel.
Is there any feature that alow to overcome this situation?
Regards,
João CarvalhoAbsolutely. You can do this easily with VRF Lite. Configure a separate VRF for your customer, place the tunnel interface and the customer's VLAN into the VRF and run your OSPF process within the VRF. This allows the router's global routing table to keep a default gateway to the ISP, but lets you define the customer's default gateway as the DMVPN hub. I have a dual-hub DMVPN network with a couple of hundred sites using exactly this approach.
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Injecting Global default Routes into a MPLS VPN
Hi,
I have a PE router running MPBGP which receives two default routes to the internet through an IPV4 BGP session. I need to import these routes in to a VRF and export them to different customer VRFs so that these VRFs are able to access Internet.
I have used the feature called "BGP Support for IP Prefix Import from Global Table into a VRF Table" (URL:http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00803b8db9.html#wp1063870)
and imported these routes into a VRF.
The issue is these routes are not propagated to any of the other PE routers which has customer VRFs configured.
Has anybody tried this or a similar method to inject a dynamic default route into a MPLS VPN.
Any suggestions would be highly appreciated.
Thanks
SubhashHi Subhash,
is there anything preventing you from terminating your internet BGP sessions in a VRF? Then everything should go smoothly, i.e. standard VRF import/export.
So possibility A) create a VRF Internet, move bgp neighbor commands there and use filters preventing anything but the default route, then use route targets to distribute the default route into other VRFs.
Possibility B) use static routing with packet leaking. Could look like this:
ip route vrf Internet 0.0.0.0 0.0.0.0 global
ip route vrf Internet 0.0.0.0 0.0.0.0 global 250
ip route Serial0/0 !assuming this is where the customer router connects.
Note: the BGP peer IP does not have to be directly connected! There has to be a LDP label for it though. so include your BGP peers network into your IGP and the backup will work, when you loose the link to the peer.
Hope this helps! Please rate all posts.
Regards, Martin -
i have an Cisco ASA 5512 working as Firewall
We configure one ASA interface connecting to Cisco router 1700 with leasd line internet service without any problem.
Now we have an extra internet connection ADSL 2MB connected to another ASA interface
I configure the ASA like this :
1- Enable interface 2 on ASA and connect it to ADSL router (interface ip 192.168.1.100 from the same ADSL router {192.168.1.1}range )
2- Create Access rule say source (My computer ip) destination ADSL network range action accept
3- Create Nat Rule say source interface inside source ip (my ip) destination interface ADSL ip 192.168.1.100 destination source router ip 192.168.1.1
4- Add static route say ADSL interface source ip my ip gateway ADSL router
This steps what I do but it doesn't work.
Thanks in advanceFYI for internet access I doubt this will work because if you configure two default route then ASA won't distribute traffic across two interface, first default route will be the one where ASA will send traffic. However from your description it is not very clear which IP address you are trying to ping and how exactly rules you have configured.
Either attach your config or paste the relevant config in post. -
Load balancing using multiple default routes
Hi Guys,
I just want to ask does creating multiple default routes on my router provides load-balancing on my WAN side? As far as i know, for example if I have two default routes on my router and let say I have two users connecting to the internet, the first one might go to the first WAN link while the second user might go to the second WAN link.
Thank you so much
Rexthere are the difference between, load balancing and load sharing..which we need to understand.
load sharing means you have 2 users, user A and User B, user A wants to use ISP1 and user B wants to use ISP2. this is called load sharing. and can be achieved via PBR (Policy based routing).
we should not try to use load balancing for Internet traffic with 2 different ISPs. -
Inject BGP Default Routes into Multiple VRF before Best Path Selection
Hello,
I have the following setup:
Multiple Border Routers with eBGP sessions to external AS. We receive a default route from this multiple AS to keep the Table manageable. We noticed an important part of our traffic was been SW routed instead of CEF when we had the Full Internet table. Router Resources came to the ground when we changed to a default.
Now I want to separate this default routes into different VRF. Attached is the Diagram.
My question is, the multiple default route all go into the BGP Table. The BGP table then select the best route and place it on the RIB and then to the FIB.
I want to redistribute the different Route on the BGP table prior to the Best path selection algorithm and placed on the RIB.
How can I achieve this?Hi,
Redistribution of multiple routes to same prefix is not possible. Even if you have configured BGP multipath and all different bgp routes got installed into routing table, during redistribution only route will be redistributed.
Also would like to understand the requirement of redistributing multiple BGP routes in to IGP. As per your diagram, 3 different eBGP sessions are on three different routers, so you can prefer eBGP route over iBGP received from other routers and can distribute eBGP route to IGP from each router. Thus you will have three different default routes in to IGP in core.
Please don't forget to rate this post if it has been helpful
- Akash -
Distribution of default route of four different ISP in a WAN MPLS
We´ve a MPLS Network, there is a vrf, the Green vrf, in wich are the users, now we are going to have four connections to internet in each one we are going to be receiving the default route, but we want to control the use of that connections, so if you are an user in one PE your default route must be provided depending on the region in wich you are. We´ve route reflectors.
How can we make the distribution of the default route depending of the region in wich the user is, such that the PE_11 gets his default route from the PE_ 1 and not from the PE_3, and the users in the PE_13 gets his default route from the PE_3 and not from the PE_5.
If we put the four defaults route in the vrf green an let bgp works, the route reflectors are going to distribute de best route that they learn, so will be only one ”best” default route out of the four we are having, and we need to balance the traffic.
How can we solve this?
The equipment involved is 7613 with IOS 12.2(33)SRD3Hello.
If your PE_1, PE_5, PE_6 and PE_3 use different RD for the vrf, RR would reflect all the "default gateways" as they are different in terms of VPNV4 prefix.
So, now you need a solution to prefer one PE over another. The best would be to use communities, like:
PE_1 - injects 1:1
PE_3 - injects 1:3
PE_5 - injects 1:5
PE_6 - injects 1:6
Now regions could have following routing policy:
if community matches 1:1 then
set local-pref 140
elseif community matches 1:3 then
set local-pref 130
Per region you would assign high LP for "closer" exit-point.
Now you have typical configuration per region and failover mechanism between them all. -
Stopping ISIS ipv6 (Multi Topology) Default Route
Dear Team
I am facing the following issue, not sure has it been worked out before.
We can stop Default Route on ISIS IPv6 Level-1 routers from nearest L1/L2 Routers, through set-attached-bit , when ISIS Ipv6 is deployed in Single Topology, with set attached bit default route is removed both ISIS Ipv4 & Ipv6 routing tables.
however
it does not work when ISIS IPv6 is deployed in Multi-Topology. I Applied to control it through Ipv6 prefix-list, but is not beneficial, as level-1 routers are still receiving the default route.
router isis
address-family ipv6
redistribute isis level-2 into level-1 distribute-list st
where distribute-list "st " specifically denies the default route and allow others.
ipv6 prefix-list st seq 1 deny ::/0 (Default Route)
ipv6 prefix-list st seq 2 permit 2002:19:19::1/128
ipv6 prefix-list st seq 3 permit 2002:19:19::2/128
How we can stop a default route on ISIS IPv6 Level-1 Routers injected from nearest L1/L2 Routers.
Any Help will be highly appreciated.
Thanks
AhadHi ,
What I found is "
If there are parallel adjacencies to the same neighbor (on different interfaces) normal
IS-IS behavior is to suppress the advertisement of the additional adjacencies unless TE is
enabled. This redundant information is not needed in order to correctly run SPF.
Indication that the adjacency has been suppressed.
This should not be a cause of concern as it has no operational impact.
there is an Internal BUG for the same :
IS-IS Advertises Parallel Adjacencies when TE is NOT enabled
CSCum06418
Thanks-
Afroz
[Do rate the useful post]
***Ratings Encourages Contributors*** -
Configuring two default gateways
Hello all,
I would like to know if the CSS supports the configuration of two default routes and if it is supported by Cisco?
The goal of this is to perform load balancing between the two default gateways.
Thanks in advance for your answer.
Regards.
AlexHi Alex,
Yes, The CSS can handle two default gateways. Give the command twice. For eg.
ip route 0.0.0.0 0.0.0.0 10.10.10.1 1
ip route 0.0.0.0 0.0.0.0 10.10.10.2 2
In this eg, the 10.10.10.1 will have priority as the metric is 1. However, if you want to load balance between them set the metric 1 for both of them.
Hope this helps.
Regards,
Sagar -
Hi,
I had border router, ipv6 BGP peering to upstream ISP and it learned about 5K of IPv6 BGP routes.
Internally I had another router iBGP peering with border router. But I do not want this internal router learned full ipv6 routes.
I would like it learn ipv6 route from 1st level upstream only and default route.
Question is what is IPv6 default route to internet ? for ipv4 it is 0.0.0.0/0
It is ::/0 ? or 2001::/23
RegardsThe IPv6 equivalent to IPv4's 0.0.0.0/0 is ::/0
So, answering to your question: default route for IPv6 is ::/0
Cheers, Gustavo -
ASA 5505 - 2 Internet Connections, Problems with the Default Route
Hey there,
i have a Problem at a Customer Site at the moment. The customer uses an ASA 5505 with two internet connections attached to it. On the first connection (which is the only one in use at the moment) he has some Static-PAT's from Outside to Inside where he translates different services to the internal servers. He also has a site-2-site VPN terminating there and AnyConnect.
He now wants to switch the Internet Traffic from Inside to the new Internet Connection. Therefore changing the default route to that new ISPs Gateway. The problem now is, that no traffic recieved on the old "outside" Interface is transmitted back out of that old "outside" Interface. And this happens although the "same-security permit intra-interface" command is set.
Can you tell me what's wrong here? For every Static-PAT from outside to inside there is also a dynamic PAT from inside to outside. But the ASA seems to ignore this. I have not looked into the Logs yet, was too busy finding the problem because i had no real time window to test on the productive ASA.
Can it be achieved in any way? Having a default route on the ASA which leads any traffic to the second internet connection while still having connections on the first internet connection where no explicit route can be set? Because connections arrive from random IPs?
Many thanks for your help in advance!
SteffenPhillip, indeed , I have as well read may comments,it all depends on your environment as they all differ from one another, you best bet is to have a good solid plan for upgrade and fall back. You do have a justification to upgrade for features needed, so I would suggest the following:
1- Do a search again in forum for ASA code upgrades and look at comments from users that have gone through this process and note their impact in fuctionality if any. I believe this is good resource to collect information .
2- Very important , look into release notes for a particular version. For example version 8.0, look into open CAVEATS usually at the end of the link page, reading the open bugs gives you clues what has not yet been resolved for that particular code and if in fact could impact you in your environment, it is possible that a particular bug does not realy apply to your environment becuase you have yet not implemented that particualr configuration. Usually we all try to aim towards a GD (General Deployment) code which is what we all understand is most stable but not necesarily means you have to be stack in that code waiting for another GD release, in my personal experience I have upgraded our firewall from 7.2 to 8.0(3) long ago and had no issues, and recently upgraded to 8.0(4)when it was first release in August this year.
Release notes
http://www.cisco.com/en/US/products/ps6120/prod_release_notes_list.html
3- AS a good practice precaution -
a-Backup firewall configs in clear text as well as via tftp code.
b-Backup running code and ASDM version code currently running in firewall.
c- Save the output of " show version " to have as reference for all the feature licenses you currently have running as asll as activation keys - good info to have to compare with after upgrade.
d- Ensure that the code you will be using to upgrade also uses correct ASDM version code.
I think with thorough assesment and preparation you can indeed minimize impact.
Rgds
Jorge -
I am having trouble connecting to my in-home internet via my wireless router. The IPad says I'm connected to the router, but I am unable to receive email, Facebook and Safari. I run through Charter Cable. This only occurs on my IPad. My desktop works fine.
Although it may ultimately be necessary to perform a Factory Default Reset on the AirPort Extreme and start over with a new configution, we can first try to see if things will work with the existing settings on the device.
Push the reset button (if present) on the cable modem
Power off the modem by pulling the power cable
Remove the internal battery from the modem (if easily accessible)
Power off the AirPort Extreme and every other device on the network....order is not important
Wait at least 20 minutes....longer is better
Re-install the battery in the modem if it was removed previously
Make sure that the Ethernet cable from the modem is connected to the WAN port (circle of dots icon) on the AirPort Extreme
Power up the modem and let it run 4-5 minutes buy itself
Power up the AirPort Extreme and let it run 4-5 minutes
Then power up each other network device one at a time about a minute apart
Check for a good Internet connection on the network with all devices
If still no luck, you will need to perfom a Factory Default Reset on the AirPort Extreme as follows:
Pull the power plug from the back of the AirPort Extreme
Hold in the reset button and keep holding it another 8-10 seconds while you simultaneously plug the power back in to the AirPort Extreme
Release the reset button and allow 25-30 seconds for the AirPort Extreme to restart to a slow, blinking amber light
Then open AirPort Utility end reconfigure the AirPort Express again. -
ASA 5520 - Can not change default route.
Hi
My asa is sitting behind a router the next hop from the ASA to the router is 10.0.0.5 I have tried to change the default route to route DMZ 0 0 10.0.0.5 to no availability right now the default route is (S* 0.0.0.0 0.0.0.0 [1/0] via 172.16.8.20, Outside) but even if I were to do a "no route Outside 0 0 172.16.8.20" the default route does not disappear when I do a "sh route" command. ant help would be greatly appreciated.I apologize for not being clear hopefully this helps. Basically the default route should be: route DMZ 0.0.0.0 0.0.0.0 10.10.10.5, I had to add a metric of 2 because otherwise it would conflict with the Gateway of last resort, the interesting part is if I try to remove the current gateway of last resort then the error I get is %No matching route to delete and I try to add the new route I get ERROR: Cannot add route entry, conflict with existing routes.
**"show ip address" output---
Interface Name IP address Subnet mask Method
GigabitEthernet0/0 Outside 172.22.8.166 255.255.252.0 CONFIG
GigabitEthernet0/3 DMZ 10.10.10.16 255.255.255.0 CONFIG
Management0/0 management 192.168.100.1 255.255.255.0 CONFIG
GigabitEthernet1/0 Inside 172.16.0.2 255.255.252.0 CONFIG
GigabitEthernet1/1 VPN X.X.X.X 255.255.255.240 CONFIG
Current IP Addresses:
Interface Name IP address Subnet mask Method
GigabitEthernet0/0 Outside 172.22.8.166 255.255.252.0 CONFIG
GigabitEthernet0/3 DMZ 10.10.10.16 255.255.255.0 CONFIG
Management0/0 management 192.168.100.1 255.255.255.0 CONFIG
GigabitEthernet1/0 Inside 172.16.0.2 255.255.252.0 CONFIG
GigabitEthernet1/1 VPN X.X.X.X 255.255.255.240 CONFIG
**"show running-config" output---
!The DMZ route should be the gateway of last resort
route DMZ 0.0.0.0 0.0.0.0 10.10.10.5 2
route Outside 10.0.1.0 255.255.255.252 172.22.8.20 1
route Outside 10.0.2.0 255.255.255.252 172.22.8.20 1
route Outside 10.0.4.0 255.255.255.252 172.22.8.20 1
route Outside 10.0.5.0 255.255.255.240 172.22.8.20 1
route Outside 10.0.6.0 255.255.255.252 172.22.8.20 1
route Outside 10.0.25.0 255.255.255.0 172.22.8.20 1
route Outside 10.0.52.0 255.255.255.0 172.22.8.20 1
route Inside 172.16.0.0 255.255.252.0 172.16.0.3 1
route Outside 172.16.6.0 255.255.255.0 172.16.6.1 1
route Outside 172.22.0.0 255.255.0.0 172.22.8.20 10
route Outside 192.168.0.0 255.255.255.0 172.22.8.20 255
route DMZ 192.168.200.0 255.255.255.0 156.108.124.66 1
**"show route" output ---
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.22.8.20 to network 0.0.0.0
S 172.16.6.0 255.255.255.0 [1/0] via 172.16.6.1, Outside
[1/0] via 172.22.8.20, Outside
C 172.16.0.0 255.255.252.0 is directly connected, Inside
C 172.22.8.0 255.255.252.0 is directly connected, Outside
S 172.22.0.0 255.255.0.0 [10/0] via 172.22.8.20, Outside
D 192.168.4.8 255.255.255.252 [90/2178816] via 172.16.0.3, 66:37:21, Inside
D 192.168.4.9 255.255.255.255 [90/2178816] via 172.16.0.3, 66:37:21, Inside
S 10.0.2.0 255.255.255.252 [1/0] via 172.22.8.20, Outside
D 10.0.0.0 255.255.255.0 [90/3072] via 172.16.0.3, 66:37:21, Inside
C 10.10.10.0 255.255.255.0 is directly connected, DMZ
S 10.0.1.0 255.255.255.252 [1/0] via 172.22.8.20, Outside
S 10.0.6.0 255.255.255.252 [1/0] via 172.22.8.20, Outside
S 10.0.4.0 255.255.255.252 [1/0] via 172.22.8.20, Outside
S 10.0.5.0 255.255.255.240 [1/0] via 172.22.8.20, Outside
S 10.0.25.0 255.255.255.0 [1/0] via 172.22.8.20, Outside
S 10.0.52.0 255.255.255.0 [1/0] via 172.22.8.20, Outside
S 192.168.0.0 255.255.255.0
[255/0] via 172.22.8.20, Outside
D 192.168.100.0 255.255.255.0 [90/3072] via 172.16.0.3, 66:37:21, Inside
! I have tried to remove the route below with the command "no route Outside 0 0 172.22.8.20" but always get the error %No matching route to delete
S* 0.0.0.0 0.0.0.0 [1/0] via 172.22.8.20, Outside
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