Hello, I am trying to implement a Broadcast GRE Tunnel that is described at this link http://linux-ip.net/gl/ip-tunnels/node9.html but it doesnt seem to be working. I am seeing the GRE packets for both networks on both sniffers but the tcpdump i tun0 doesnt show any of the packets from the remote end getting there. Can you tell me if I have something misconfigured or if what I am trying to do is impossible. Ive listed all the configuration information under the ascii drawing Basically trying to get routing information from network A to network B without knowing what the ip address is for remote eth0 is, hence the multicast address, and keeping the overhead as low as possible. Thanks. Router 1 2 Router +---------+ +--------+ +---+ +---+ +--------+ +---------+ |network A|--| Net-99 |-----|INE|--|INE|-----| Net-77 |--|network B| +---------+ +--------+ | +---+ +---+ | +--------+ +---------+ eth1 eth0 | PT CT CT PT | eth0 eth1 | | +-------+ +-------+ |sniffer| |sniffer| +-------+ +-------+ Net99 eth0: 172.16.1.240/24 Net99 eth1: 99.99.99.99/8 Net77 eth0: 172.16.2.240/24 Net77 eth1: 77.77.77.77/8 INE - Inline Network Encryptor INE1 PT: 172.16.1.1/24 INE1 CT: 10.0.0.1/24 INE2 PT: 172.16.2.1/24 INE2 CT: 10.0.0.2/24 Router Net99 ============ Create Tunnel ------------- modprobe ip-gre ip tunnel add tun0 mode gre remote 239.0.0.1 local 172.16.1.240 dev eth0 ip addr add 10.20.1.1/24 dev tun0 ip link set tun0 up ip link seg gre0 up ======================================================================== zebra.conf ---------- hostname net99 password itac enable password itac interface eth0 description To KG-175B 789 ip address 172.16.1.240/24 multicast interface eth1 description To airborne network ip address 99.99.99.99/8 multicast interface tun0 description tunnel for ospf ip address 10.20.1.1/24 multicast ip route 0.0.0.0/0 172.16.1.1 ======================================================================== ospfd.conf ---------- router ospf ospf router-id 172.16.1.240 ospf abr-type cisco redistribute connected network 10.20.1.0/24 area 0 network 99.0.0.0/8 area 1 area 1 stub ======================================================================== Router Net77 ============ Create Tunnel ------------- modprobe ip-gre ip tunnel add tun0 mode gre remote 239.0.0.1 local 172.16.2.240 dev eth0 ip addr add 10.20.1.2/24 dev tun0 ip link set tun0 up ip link set gre0 up ======================================================================== zebra.conf ---------- hostname net77 password itac enable password itac interface eth0 description To KG-175E 23969 ip address 172.16.2.240/24 multicast interface eth1 description To airborne network ip address 77.77.77.77/8 multicast interface tun0 description tunnel for ospf ip address 10.20.1.2/24 multicast ip route 0.0.0.0/0 172.16.1.1 ======================================================================== ospf.conf --------- router ospf ospf router-id 172.16.2.240 ospf abr-type cisco redistribute connected network 10.20.1.0/24 area 0 network 77.0.0.0/8 area 1 area 1 stub ========================================================================
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