04-20-2003 09:08 PM - edited 03-02-2019 06:46 AM
This one is making me pull my hair out!
We have a central office with branch offices connecting in. Some remote offices connect to a branch which then connects to central. We were using OSPF everywhere and all was well with the world.
Then one branch office was sold off, this branch had a remote office hanging off of it. I have to bring the connection in via a firewall now. So I removed OSPF from the branch and remote offices and put static routes in. All is working well and traffic flows normally. BUT... When I telnet to the remote office from central office and try to ping central, requests time out. From remote I can ping branch and serial i/f at branch that leads to central, but no futher. NOW.. still telneted to remote office I do an extended ping and it goes through OK!! Why?? Configs below.
Setup
Central Office
|
|Serial link
|
Branch Office
|
|serial link
|
Remote office
Branch Config
!
version 12.0
service timestamps debug uptime
service timestamps log datetime localtime
service password-encryption
service linenumber
!
hostname Branch Office
!
enable password
!
ip subnet-zero
!
process-max-time 200
!
interface Serial0
Description Connection to central office
bandwidth 128
ip address 172.x.x.x 255.255.255.252
ip redirects
ip directed-broadcast
no ip mroute-cache
compress stac
!
interface Serial1
Description Connection to Remote office
bandwidth 64
ip address 172.x.x.x 255.255.255.252
ip redirects
ip directed-broadcast
ip ospf authentication-key 7 120A0916001F15
no ip mroute-cache
compress stac
!
description Branch Office - Ethernet LAN
ip address 172.x.x.1 255.255.255.128
ip directed-broadcast
full-duplex
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.x.x.x Serial IP of Central
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 172.x.x.x 255.255.255.240 172.x.x.x Serial IP of remote
no ip http server
!
Edited out.
Remote config
version 12.1
service config
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname Remote Office
!
logging buffered 4096 debugging
enable password
!
!
!
!
!
memory-size iomem 25
ip subnet-zero
!
interface Serial0
description Remote to branch
bandwidth 64
ip address 172.x.x.x 255.255.255.252
ip directed-broadcast
compress stac
!
interface FastEthernet0
ip address 172.x.x.129 255.255.255.240
ip directed-broadcast
speed auto
full-duplex
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.x.x.x Serial 1 Branch office
no ip http server
!
end
Any thoughts and suggestions as to why data flows ok but a lousy ping fails, extended ping works!!
Ian
04-21-2003 06:09 AM
Sounds like the central office doesn't have a route to the serial side of the remote.
04-21-2003 12:04 PM
What are you changing when you use extended? (Source address?)
Try doing an extended traceroute with both your outbound facing interface and one using you LAN as the source. With both of these traces use the Record option from your extended commands. You will find out which router doesn't know about which network.
Also, why change your standard. Re-terminate the remote office to another branch and run OSPF. By maintaining standards throughout the network you will lessen your support problems.
04-21-2003 08:20 PM
Yes, extended ping from remote office I add the remote office fast ethernet address of router and all works.
Central office can ping and traceroute to every address in the chain to remote office.
Extended traceroute works from remote to central when I add source address.
Normal traceroute from central works every time!!!!
So, Central office knows route to remote OK. All data traffic passes from remote to central with no problems. Its just ping that bombs out past the branch office, so I did a icmp debug at central office and it shows the pings recieved and echo reply being sent, to serial interface of remote router, as it should be. But they never get there. This is so weird!!!!!
04-21-2003 11:09 PM
OK people I have sorted the problem. I added a static route at the central office to cover the network used on the serial link between remote and branch. It works fine now. Obvious with 20/20 hindsight!
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