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I am having a problem bringing up a GRE tunnel between my wrt54gs running OpenWRT and a Cisco router. I've done what I can see to do from my googling, but it's still not working. Here's what I have on the Linksys:
root@OpenWrt:/etc# ip tunnel show
gre0: gre/ip remote any local any ttl inherit nopmtudisc
gre1: gre/ip remote 18.104.22.168 local 22.214.171.124 ttl 255
root@OpenWrt:/etc# ip addr show
7: gre0@NONE: <NOARP> mtu 1476 qdisc noop
link/gre 0.0.0.0 brd 0.0.0.0
10: gre1@NONE: <POINTOPOINT,NOARP,UP> mtu 1476 qdisc noqueue
link/gre 126.96.36.199 peer 188.8.131.52
inet 192.168.254.1/30 scope global gre1
root@OpenWrt:/etc# ip route show
192.168.254.0/30 dev gre0 proto kernel scope link src 192.168.254.1
192.168.20.0/24 dev gre0 scope link
192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.1
184.108.40.206/24 dev vlan1 proto kernel scope link src 220.127.116.11
default via 18.104.22.168 dev vlan1
default via 192.168.1.1 dev br0 scope link
root@OpenWrt:/etc# ping 192.168.20.1
PING 192.168.20.1 (192.168.20.1): 56 data bytes