[Cerowrt-devel] ipv6 on comcast with 18.06.1

[Dave Taht]

On Mon, Oct 1, 2018 at 10:13 AM Michael Richardson <mcr at sandelman.ca> wrote:
>
>
> Dave Taht <dave.taht at gmail.com> wrote:
>     > hmm... bad udp checksum???
>
> With some capture mechanisms, tcpdump gets bogus values because the hardware
> did the checksums.  I wouldn't imagine that we have hardware checksum offload
> on openwrt devices, but could be.
>
> Or it's a real issue.

Checksums were good on the mips device I have not getting internal dhcpv6pd,
(dhcpv6 and slaac work on the external interface)...
but I didn't check them all, and it's possible the pool is exhausted.

Wasn't planning on doing this today! Hoped it was a firewall rule, frankly. :(

>
>     > :/tmp# 09:12:17.404257 IP6 (flowlabel 0xdfff4, hlim 1, next-header UDP
>     > (17) payload length: 159) fe80::20d:b9ff:fe43:a06c.546 > ff02::1:2.547:
>     > [bad udp cksum 0x58f4 -> 0xc4a1!]  On Mon, Oct 1, 2018 at 9:12 AM Dave
>     > Taht <dave.taht at gmail.com> wrote:
>
> Did you capture with -i device, or -i any?

device.

>
> --
> ]               Never tell me the odds!                 | ipv6 mesh networks [
> ]   Michael Richardson, Sandelman Software Works        | network architect  [
> ]     mcr at sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [
>


-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619