I have a mystery and before I call Leonard Nimoy in to do a "In Search Of...." episode thought I post here.
I'm converting a remote site from ISDN (At the moment using Ascend Pipelines) and converting the site to Point-to-point using a 1760 Cisco on the remote end and a 7204 vxr on the other. After conversion, everything works except DHCPOFFER doesn't hit the workstation. EVERYTHING works except that. Ping/Telent/Http..blahblah. I can see DHCPDISCOVER packet hit the DHCP server, I can see the DHCP server sending a DHCPOFFER but workstation doesn't get it. If I put a different IP subnet for this location the offer goes through. Routing problem right?
[workstation] - IP 172.22.36.7
[1706 Cisco] - E0=172.22.36.1 S0=172.22.136.1 (ip helper on E0)
[7204 VXR Cisco] - S0=172.22.136.2 E0=172.22.1.8 (Ip helper on E0)
[2948G-L3 Cisco] - 172.22.1.1
[DHCP Server] - 172.22.1.50
TROUBLESHOOTING THUS FAR:
1. Check routes on all routers/servers/workstations
2. Clear routers on everything. We are using EIGRP.
3. Enable Show Debug on all routers
with this I see the DHCPDISCOVER hit everything,
I don't see an DHCPOFFER hit the 172.22.1.1 on the way back
4. Put a Sniffer on DHCP server and on the Workstation ends
- Sniffer shows its heading to the right place
5. Enable DHCP debug on the server, shows everything is fine except it can't send DHCPOFFER.
6. If I go to a workstation after converting the site, and it still has an IP, the dhcpserver can ping the workstation no problem. Once I release the IP it can't get another one.
7. I have 7 total sites, 4 sites are working - three are not, using the exact same config, except different ips.
8. I removed all sites from the 7200VXR and cleared all routes and then attempt switch over but still had problem. I was thinking something was advertising the wrong route.
I know I can get it to work if I change the IP subnet. Really don't want to do this, need to figure out issue, who knows when and where it will rear its ugly head.
Any help will be great!