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GRE Blues Open BSD -> Cisco
I am trying to create a GRE tunnel on an OpenBSD 3.2 box running as a
gateway with dsl on pppoe. Have configured as per man page etc as best as I
am able (newbie) and I am not able to get the tunnel to work. Here is the
config. This is an urgent requirement and I appreciate your assistance.
In sysctl.conf
#####################################
net.inet.gre.allow=1
On cisco router
#####################################
interface Tunnel1
ip address x.x.103.241 255.255.255.252
tunnel source x.x.96.233
tunnel destination x.x.100.26
On OpenBSD Box (output of ifconfig gre0)
#####################################
x.x.103.242 is an inet alias on the second nic which also handles a pppoe
connection for dsl.
gre0: flags=d011<UP,POINTOPOINT,LINK0,LINK2,MULTICAST> mtu 1450
physical address inet x.x.103.242 --> x.x.103.241
inet x.x.100.26 --> x.x.96.233 netmask 0xfffffffc
Route add
#####################################
route add x.x.96.0/24 x.x.96.233
Partial output of netstat -rn
#####################################
Internet:
Destination Gateway Flags Refs Use Mtu
Interface
default 172.31.18.95 UGS 3 90381 1492 tun0
127/8 127.0.0.1 UGRS 0 0 33224 lo0
127.0.0.1 127.0.0.1 UH 2 0 33224 lo0
172.31.18.95 x.x.100.26 UH 1 0 1492 tun0
x.x.96/24 x.x.96.233 UGS 0 0 - gre0
x.x.96.233 x.x.100.26 UH 1 0 - gre0
x.x.100/24 link#2 UC 0 0 - sis1
x.x.103.240 link#2 UHL 1 0 - sis1
=>
x.x.103.240/30 link#2 UC 0 0 - sis1
x.x.103.242 127.0.0.1 UGHS 0 0 33224 lo0
I have tried a couple of variations on the above with no effect. The gre
tunnel is not coming up. Have I forgotten to check something? Is there some
debugging commands I could use to trouble shoot this? Thanks in advance.
Shane Cosgrove
www.networksmm.com.au
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