Re: gre tunnel problem

[gary%duzan.org@localhost]

=> On Thu, Oct 27, 2011 at 12:03:53PM -0500, David Young wrote:
=>> I have discovered that wm(4)'s IPv4 checksum offload (ifconfig wm0
=>> ip4csum) interferes with IPv6 transmission through gre(4).  I realize
=>> that IPv6 is not your problem, but it does make me wonder whether more
=>> offload problems lurk.
=>
=> The interference between checksum-offload and tunnels was in gre(4).
=> gif(4) was affected, too.  Fixed in -current.
=>
=> The reason that bnx(4) worked and wm(4) didn't with the ip4csum-tx
=> option was that bnx(4) didn't use csum_data, but wm(4) did.  Now gre(4)
=> and gif(4) zero both csum_data and csum_flags.

   Good to hear. I suspect this might have been causing some IPv6/IPSEC
problems for me, as well. Would this impact 5.x? I've had mixed success
getting a tunnel going between a 5.1-SNAPSHOT box and a -current box.

   Thanks.

                                      Gary Duzan