Hello!
Here in our remote office we get dhcp from our corporate office via a L2TP tunnel between two 2901 routers. This was working fine, until I replaced our old hp procurve 1800 switch with a new 3750x switch, and now I can't get the layer 3 working across the tunnel.
quick diagram:
remote hosts----> 3750x --->2901 l2tp <--------->2901 l2tp -----> HP procurve ------> corporate office/servers/dhcp server
my first thought was it was just not letting dhcp through, but then I assigned a static ip address on my remote end, and I still can't ping across to the corporate office.
The l2tp tunnel is up, because I can see the MAC address on the corporate site if I do a: show mac address-table.
Jax3750x#show mac address-table
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
....<abbreviated output>
1 d43d.7e57.619f DYNAMIC Gi1/0/17

1 f46d.042c.8ec6 DYNAMIC Gi1/0/17

1 f46d.044e.aac2 DYNAMIC Gi1/0/17

1 f872.ea21.cba9 DYNAMIC Gi1/0/17

50 001f.2863.5ea0 DYNAMIC Gi1/0/24

50 14da.e9da.8a00 DYNAMIC Gi1/0/14

50 c82a.1440.152d DYNAMIC Gi1/0/15
Total Mac Addresses for this criterion: 66
Gi 1/0/17 is the port on the 3750x switch that is connected to the 2901 router, and it shows about 30 MAC's learned from the corporate office on VLAN 1.
interface GigabitEthernet1/0/17
switchport trunk encapsulation dot1q
switchport mode trunk
but DHCP requests and pings are not getting across!
I've banged my head on this for about 8 hours and can't find anything on the support boards about this issue.
Any push in the right direction would be greatly appreciated.
Rob.
