nc: connect to b:b:b:b::1:1 port 53 (tcp) failed: Operation timed out

Sat Dec 29 12:02:53 UTC 2012

On 12/28/2012 05:59 AM, Michael Grimm wrote:
> Hi --
> 
> I do run both my primary and secondary nameservers (distinct servers) in FreeBSD jails1 and jail2 as outlined below:
<snip>
> I do see using tcpdump at server1:
> 
> | 00:00:02.066251 xx:xx:xx:xx:xx > yy:yy:yy:yy:yy, ethertype IPv6 (0x86dd), length 94: (flowlabel 0xa3c71, hlim 63, next-header TCP (6) payload length: 40) b:b:b:b::1.64158 > a:a:a:a:1::1.53: Flags [S],
> cksum 0x959b (incorrect -> 0x58f9), seq 3833155181, win 65535, options [mss 1440,nop,wscale 6,sackOK,TS val 495939599 ecr 0], length 0
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
9.1's PF appears to be either corrupting or not updating the packet
checksum when it touches IPv6 packets. I was not able to figure out how
or why in my brief perusal of the source, but it seems to affect more
than just NAT66.

http://freebsd.1045724.n5.nabble.com/PF-IPv6-NAT-and-The-Curse-of-The-Invalid-Checksum-td5769669.html

-- 
Fuzzy love,
-CyberLeo
Furry Peace! - http://www.fur.com/peace/