> On 15. Apr 2022, at 20:20, Florian Smeets <f...@smeets.xyz> wrote: > > [bcc to net@ for wider exposure] > > Hi, > > there seems to be an issue with local IPv6 TCP connections on main. I have > been seeing this for a couple of months at least. pkg upgr on my webserver > hosting the pkg repo is very slow, all other hosts can connect to the pkg > repo just fine. So IPv6 connections from external hosts are not affected. > > I thought I must have misconfigured something, as my setup is a bit weird. > Yesterday I noticed the same issue on a different host, turns out all my 14.0 > hosts seem to be affected, cognet@ could also reproduce it on one of his > systems. > > The service/software used does not seem to matter, I tried with port 22, 25, > 80 and 443. > > ICMP and UDP don't seem to be affected. ping6 gets replies immediately. And > UDP connections with nc -l -u / nc -u don't have any delay, sent data is > received immediately. > > Testing local TCP connections show this: > > flo@rp64:~ $ ifconfig dwc0|grep 2003 > inet6 2003:cf:df49:c97:4c59:ebff:fec1:463d prefixlen 64 autoconf > flo@rp64:~ $ nc -v 2003:cf:df49:c97:4c59:ebff:fec1:463d 22 > [3 second delay here] > Connection to 2003:cf:df49:c97:4c59:ebff:fec1:463d 22 port [tcp/ssh] > succeeded! > SSH-2.0-OpenSSH_8.9 FreeBSD-20220413 > > tcpdump on lo0 shows that the first two SYN packets are ignored / time out, > then the connection is successfully established. > > 19:28:38.685128 IP6 2003:cf:df49:c97:4c59:ebff:fec1:463d.61294 > > 2003:cf:df49:c97:4c59:ebff:fec1:463d.22: Flags [S], seq 2489479594, win > 65535, options [mss 16324,nop,wscale 6,sackOK,TS val 3410505643 ecr 0], > length 0 > > 19:28:39.696047 IP6 2003:cf:df49:c97:4c59:ebff:fec1:463d.61294 > > 2003:cf:df49:c97:4c59:ebff:fec1:463d.22: Flags [S], seq 2489479594, win > 65535, options [mss 16324,nop,wscale 6,sackOK,TS val 3410506654 ecr 0], > length 0 > > 19:28:41.897836 IP6 2003:cf:df49:c97:4c59:ebff:fec1:463d.61294 > > 2003:cf:df49:c97:4c59:ebff:fec1:463d.22: Flags [S], seq 2489479594, win > 65535, options [mss 16324,nop,wscale 6,sackOK,TS val 3410508856 ecr 0], > length 0 > > 19:28:41.897907 IP6 2003:cf:df49:c97:4c59:ebff:fec1:463d.22 > > 2003:cf:df49:c97:4c59:ebff:fec1:463d.61294: Flags [S.], seq 2857552476, ack > 2489479595, win 65535, options [mss 16324,nop,wscale 6,sackOK,TS val > 1858349482 ecr 3410508856], length 0 > > 19:28:41.897962 IP6 2003:cf:df49:c97:4c59:ebff:fec1:463d.61294 > > 2003:cf:df49:c97:4c59:ebff:fec1:463d.22: Flags [.], ack 1, win 1276, options > [nop,nop,TS val 3410508856 ecr 1858349482], length 0 > > I need help debugging this, I don't know how to analyze this further. I will > start bisecting this, but I thought maybe someone has an idea. Hi Florian,
I can reproduce this locally, will try to figure out what is going on. If you can bisect it, it would be great. Best regards Michael > > Thanks, > Florian > <OpenPGP_0xEF5BA4DCD5A9F3C0.asc>
