From: Curt Girardin (curt.girardin@chicos.com)
Date: Fri Sep 16 2005 - 21:07:36 GMT-3
Yes you are right, it was the IPV6 MTU, not the IP MTU. That important
detail did slip me. As far was IPv6-compatable IPv4 tunnels, or ISATAP
tunnels, this is one of my weaknesses, so I can't help much there.
Sorry.
My understanding was that these types of tunnels are supposed to be used
for router-to-host or host-to-host, however, that doesn't necessarily
mean that what you are trying isn't possible.
I'll keep an eye on this thread - I'd be interested as well, since this
type of tunnel is one of my weak-points.
Thanks,
Curt
-----Original Message-----
From: Edwards, Andrew M [mailto:andrew.m.edwards@boeing.com]
Sent: Friday, September 16, 2005 8:01 PM
To: Curt Girardin
Subject: RE: ipv6 ospf over automatic 6to4 tunnels or v4 compatible v6
tunnels
Curt,
If I recall your post, you were running IPv6 OSPFv3 over point-to-point
tunnel types such as GRE IPV6IP or IPV6IP mode tunnels. And, the issue
was supposed to be IPV6 MTU because the source interfaces were ATM and
ethernet (those NMC guys are good!).
What I'm looking for are the other options for using OSPF over the
tunnels considered to be point-to-multipoint (eg. 6to4 tunnels or
v4compatible v6 addressed automatic tunnels).
Otherwise I have done debug ipv6 ospf adj and debug ipv6 ospf hello to
see if the traffic was headed out the right interface or any MTU issues
but didn't get any hits even with logging setup correctly.
I noticed that the tunnel DID join multicast group FF02::5 and that sho
ipv6 ospf int t0 indicated that the tunnel was "point-to-point" type
for OSPF (seems to contradict what docCD says about this tunnel type).
Anyhow, it's a simple setup: Two routers back to back over ethernet
running ipv4. Two loopbacks with ipv6 addresses in OSPF. I want to
setup OSPF over a v4 compatible v6 addressed automatic tunnel.
I just don't know if... Or how to get it to work....
R1 (e0/0) ---- (e0)R2
Hostname R1
Ipv6 unicast
Int e0/0
Ip address 1.1.1.1 255.255.255.0
Int lo0
Ipv6 address 2001:1::1/64
Ipv6 ospf 1 area 0
Int Tun0
Tunnel source e0/0
Tunnel dest 1.1.1.2
Tunnel mode ipv6ip auto
Ipv6 ospf 1 area 0
Router ospf 1
Net 0.0.0.0 255.255.255.255 area 0
Hostname R2
Ipv6 unicast
Int e0
Ip address 1.1.1.2 255.255.255.0
Int lo0
Ipv6 address 2001:2::1/64
Ipv6 ospf 1 area 0
Int Tun0
Tunnel source e0/0
Tunnel dest 1.1.1.1
Tunnel mode ipv6ip auto
Ipv6 ospf 1 area 0
Router ospf 1
Net 0.0.0.0 255.255.255.255 area 0
-----Original Message-----
From: Curt Girardin [mailto:curt.girardin@chicos.com]
Sent: Friday, September 16, 2005 4:49 PM
To: Edwards, Andrew M; GroupStudy CCIE-Lab
Subject: RE: ipv6 ospf over automatic 6to4 tunnels or v4 compatible v6
tunnels
Hi,
I recently did a lab that required this, and found that the MTU on each
end of the tunnel was based on the source-interface on each side,
therefore, I had to manually set it (on the tunnel interfaces I think),
using the ip mtu command.
Use debug ipv6 ospf adj on each side and pay special attention to the
MTU reported.
Curt
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Edwards, Andrew M
Sent: Friday, September 16, 2005 7:38 PM
To: ccielab@groupstudy.com
Subject: Re: ipv6 ospf over automatic 6to4 tunnels or v4 compatible v6
tunnels
Does anyone know how to get OSPFv3 to operate correctly over
point-to-multipoint interfaces such as 6to4 tunnels or automatic tunnels
usign ipv4 compatible v6 addresses?
I'm thinking its either A. Not possible or B. Possible but requires
the use of OSPF network types
Now, I've tried various combinations of option B... but to no avail....
Any ideas?
Andy
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