[Xorp-users] ARP problems with static routes in XORP

[Vikram KAUL]

Folks,

  I need help with a skeletal XORP setup with 3 routers and two hosts. I am 
seeing the problem with static routes as well as with RIP, so I will just 
describe the static case, and hope I can resolve the problem

  The network is laid out like follows


   17.17.17.x    10.1.1.x    192.168.0.x      16.16.16.x

H ---------- R ---------- R ------------- R ----------- H
.20       .1  .1       .2   .2          .3  .3         .20


HostA  : 17.17.17.20
Router1: 17.17.17.1  & 10.1.1.1
Router2: 10.1.1.2    & 192.168.0.2
Router3: 192.168.0.3 & 16.16.16.3
HostB  : 16.16.16.20

When I configure XORP for static routes (or even RIP), the unicast tables 
appear properly in the routers (1,2,3). I am able to ping and traceroute 
from one to the other without any problems

Then, when I connect the host (HostA) and configure the default gw to be 
17.17.17.1 it does the following:

Ping from 17.17.17.20 (host) to 17.17.17.1 (gw router) is OK
Ping from 17.17.17.20 (host) to 10.1.1.1   (gw router, next interface) is OK

But

Ping from 17.17.17.20 (host) to 10.1.1.2 (next hop after gw) FAILS

Same is the case in the opposite direction

I ran tcpdump on the 17.17.17.1 interface on Router1 and it is getting arp 
queries
arp who-is 10.1.1.2 tell 17.17.17.20

Why is this happening ?
Shouldn't the host merely send the ping packet to the gw router which 
should then forward it to the next hop and get the reply back in the same 
way ?

Why is arp for 10.1.1.2 being sent out by the host (17.17.17.20) ?

Is this a configuration issue at the host ? or something in XORP ?

Thanks

Vikram