Hello, I have created a GRE tunnel between two hosts A and B with endpoint addresses 192.168.0.1/24 and 192.168.0.2/24. The tunnel works fine (there are automatically created routes 192.168.0.0/24 on each host to the tunnel). I added second route to the tunnel with address 10.0.0.0/8. Works. But when I add third route with address 81.0.238.160/27, the tunnel freezes after one ping reply. Never mind if I deleted the second route, the problem is caused by the address 81.0.238.160/27 (when I remove the route, tunnel starts working again). I've tried to replace the 192.168.0.0/24 network route by host route but the problem remains. The machine is Linux host_a 2.4.32-ow1-sk831-vp2 #5 SMP Tue Mar 28 10:31:34 CEST 2006 i686 unknown unknown GNU/Linux Is it a bug? Thank you for reply! Jan Molic ---------- HOST A $ ip tunnel add host_b mode gre remote 5.6.7.8 local 1.2.3.4 $ ip link set host_b up $ ip addr add 192.168.0.2/24 dev host_b HOST B $ ip tunnel add host_a mode gre remote 1.2.3.4 local 5.6.7.8 $ ip link set host_a up $ ip addr add 192.168.0.1/24 dev host_a $ ip route x.x.x.x/x dev eth0 proto kernel scope link src 5.6.7.8 192.168.0.0/24 dev host_a scope link 127.0.0.0/8 dev lo scope link default via y.y.y.y dev eth0 metric 1 $ ping 192.168.0.2 works $ ip route add 10.0.0.0/8 dev host_a $ ping 192.168.0.2 still works $ ip route add 81.0.238.160/27 dev host_a $ ping 192.168.0.2 stops working after one reply tcpdump on host_b shows the one ping: 15:54:29.772001 IP 192.168.0.1 > 192.168.0.2: ICMP echo request, id 62556, seq 1, length 64 15:54:29.772015 IP 192.168.0.2 > 192.168.0.1: ICMP echo reply, id 62556, seq 1, length 64 $ ip route del 10.0.0.0/8 dev host_a $ ping 192.168.0.2 still no reply $ ip route del 81.0.238.160/27 dev host_a $ ping 192.168.0.2 works again
