What I suspect is the problem is when an outside request comes in on RtrA the request it correctly forwarded to the "public" web server but if it returns via RtrB (either by a default path or in this case GLBP) the NAT translation is different between RtrA and RtrB making for a different public source address coming from the web server; different from the destination address the outside host originally used. If the traffic transits the same router both in and out, NAT translations remain the same and it works.

If the public address block was the same between ISP providers, there wouldn't be a problem. Since they're not, one has to insure the same path is used for both directions or NAT is aware of different public addresses and handles that. The prior references I provided details some features in the later IOSs that can handle multihomed with different public address blocks.

Thank you all for your reply.!!!

Ediortiz, I'm sorry but I can't use BGP nor I have my own address pool…

Ariesc_33, Yes I can ping the server. Everything works fine, it even works if I use the public address from the same router the server is using as the gateway.

Josephdoherty, Thank you for the information; stateful NAT looks very promising.

I also had this same problem with the VPN clients. (the routers are also VPN servers) The vpn clients, once connected to the servers, did not reach the internal hosts if these hosts were using the other router as the gateway. I fixed this using a reverse route injection and an IGP to inform both routers of the source addresses. Unfortunately, it is a very different story with the connections from the Internet… I'll keep trying and I will tell you if I get it to work.

Thanks again!!!

Mariano

Mariano I got the same problem, And I make It work today using SNAT commands, if you still interested let me know so i can post the router configuration examples..

Hi Raul,

I do know, this is a very old thread... but is it possible to get your config examples???

Tank you!

Hi Raul,

I have exactly the same setup and the same issue, I would really appreciate it if you can help me out by providing some details or a working config file.

Thanks

Hi Alex

Check attachment, 

HTH

Houtan

Thanks Houtan,

Its working fine now. Your config helped me find the missing pieces and its all good now.

Thank You

I'm glad it helps you. Therefore, rate it and mark it as correct. It helps others to identify the right solution.

Houtan