01-22-2009 09:06 AM - edited 03-04-2019 12:56 AM
All,
Is it possible to put an HSRP configuration on 2 routers that face the internet? Would I eat 3 public addresses doing it?
router 1: 5.5.5.2
router 2: 5.5.5.3
standby: 5.5.5.1
Is this possible?
Thanks,
John
Solved! Go to Solution.
01-22-2009 09:18 AM
John
Assuming that router1 and router2 are connected on a common subnet, which is the Internet facing interfaces, then yes this is possible. And yes it would consume 3 public addresses.
A somewhat different question from "can I do this" is the question of "why would I want to do this". Since HSRP generally is to solve the problem of redundant gateways on the local subnet, what problem is it solving to put it on the Internet facing interfaces?
HTH
Rick
01-22-2009 09:18 AM
John
Assuming that router1 and router2 are connected on a common subnet, which is the Internet facing interfaces, then yes this is possible. And yes it would consume 3 public addresses.
A somewhat different question from "can I do this" is the question of "why would I want to do this". Since HSRP generally is to solve the problem of redundant gateways on the local subnet, what problem is it solving to put it on the Internet facing interfaces?
HTH
Rick
01-22-2009 09:22 AM
Well, no problem. I'm studying for a test and one of the practice questions was how to provide redundancy on an internet link for VPN users without having to reconfigure their client. The answer was HSRP, and that's the only way I could figure it would be the case. Each one of the clients would configure their software to connect to the standby IP, and in case that dies, the other will still be valid. So, there could be other reasons (aside from GLBP), like host a webserver for instance. I could see doing it for that also.
Thanks Rick!
John
01-22-2009 09:58 AM
Hello John,
we use this setup to perform Stateful IPSec failover:
we have two 7206VXR with NPE GE2 and they share the IPSec SA using a TCP connection between them.
the ip address used to terminate the IPSec is actually the HSRP VIP on the public lan interface.
Hope to help
Giuseppe
01-22-2009 10:32 AM
How does Stateful failover IPSec work for you?
During three months of testing last year, I
found that Stateful IPsec failover on Cisco
IOS is not stable.
What version IOS do you use?
01-22-2009 11:07 AM
Hello David,
we actually had problems of sudden and random connections drops at first.
We opened a Service Request.
they suggested us to keep the configuration equal (you need to do it manually it is not like in PIX).
at the end at the second IOS upgrade, packet capture and two mounths it is working better
We currently use
c7200p-advsecurityk9-mz.124-20.T.bin
before in 12.4(19)T the first ios suggested for upgrade we couldn't reach the hot standby redundancy state.
However, the feature has some strange behaviour like it triggers a reload when a change of state master to slave happens !
This happens also if you shut one interace either public or private or if you try to remove redundancy configuration. (at least in 12.4(19)T)
states are ruled by HSRP group priorities and we configured higher priorities on both public and private interfaces on the same router with tracking.
This is different from what suggested in the feature where they suggest to use same priorities on both routers: this can cause unnecessary changes of state.
RT-RM-TLD066-NEW-VPN-2 uptime is 19 weeks, 1 day, 20 hours, 35 minutes
System returned to ROM by reload at 00:11:25 MEST Wed Sep 10 2008
System restarted at 00:12:40 MEST Wed Sep 10 2008
System image file is "disk2:c7200p-advsecurityk9-mz.124-20.T.bin"
RT-RM-TLD066-NEW-VPN-2#sh red stat
my state = 13 -ACTIVE
>>> peer state = 8 -STANDBY HOT
Mode = Duplex
Unit ID = 0
Maintenance Mode = Disabled
Manual Swact = Enabled
Communications = Up
client count = 9
client_notification_TMR = 30000 milliseconds
RF debug mask = 0x0
RT-RM-TLD066-NEW-VPN-2
Hope to help
Giuseppe
01-29-2009 04:03 AM
Hope this link can help you. Im about to test it now with two 2851
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/ht_sfo.html
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide