Ian Smith
2016-Apr-08 05:51 UTC
IPFW with NAT : Problems with duplicate packets on FreeBSD 10.3-RC3
On Thu, 7 Apr 2016 17:08:38 +0100, Dr Josef Karthauser wrote: [ AppleMail msgs fail to quote properly in pine, so a partial quote: ] > Looks like the first packet is being retransmitted, which means that > the nat is probably misconfigured and the TCP connection is broken in > some strange way. > Does anyone have a clue as to where to look? The ipfw rules are > simple enough - what have I missed? Do you have TSO enabled on that NIC? If so, see ipfw(8) BUGS, third last para. If not, no idea .. cheers, Ian
Dr Josef Karthauser
2016-Apr-08 09:03 UTC
IPFW with NAT : Problems with duplicate packets on FreeBSD 10.3-RC3
> On 8 Apr 2016, at 06:51, Ian Smith <smithi at nimnet.asn.au> wrote: > > On Thu, 7 Apr 2016 17:08:38 +0100, Dr Josef Karthauser wrote: > > [ AppleMail msgs fail to quote properly in pine, so a partial quote: ] > >> Looks like the first packet is being retransmitted, which means that >> the nat is probably misconfigured and the TCP connection is broken in >> some strange way. > >> Does anyone have a clue as to where to look? The ipfw rules are >> simple enough - what have I missed? > > Do you have TSO enabled on that NIC? If so, see ipfw(8) BUGS, third > last para. If not, no idea .. >Thanks Ian, It was exactly that issue! I wish I had remembered that I?d seen that in the man page; would have saved hours of debugging :) Joe ? Dr Josef Karthauser Chief Technical Officer (01225) 300371 / (07703) 596893 www.truespeed.com / theTRUESPEED @theTRUESPEED