Ping problem

I am still having issues getting CIPE working.  It looks like it is close, but my ping is acting a little weird.  The two machines have Ip address 192.168.10.1 and 192.168.1.248, I do a "tcpdump -i cipcb0"  on both machines and do a ping and I get the following:

ping from 192.168.1.248 to 192.168.10.1:
both tcpdumps display:
192.168.1.248 > 192.168.10.1: icmp: echo request (DF)
192.168.10.1 > 192.168.1.248 icmp: echo reply

This would tell me that the ping should be completing fine, but the actual Ping command fails on every attempt.

ping from 192.168.10.1 to 192.168.1.248
both tcpdumps display
192.168.10.1 > 192.168.1.248: icmp: echo request (DF)

neither display the echo reply and of course the Ping fails.

Any ideas?