Re: pay.gov and IPv6

[joel jaeggli <joelja () bogus com>]

00:02:02.758900 IP6 2601:647:4201:XXXX.60962 >
2605:3100:fffd:100::15.443: Flags [S], seq 2375673666, win 65535,
options [mss 1440,nop,wscale 5,nop,nop,TS val 568401205 ecr
0,sackOK,eol], length 0

00:02:02.811619 IP6 2605:3100:fffd:100::15.443 >
2601:647:4201:XXXX.60962: Flags [S.], seq 2570148804, ack 2375673667,
win 4320, options [mss 1440,nop,nop,TS val 2246573166 ecr
568401205,sackOK,eol], length 0

it's happy to do 1440 which is unsprising, as1239 is probably not
therefore the source of the pmtud hole.

On 11/20/16 11:51 PM, JORDI PALET MARTINEZ wrote:
> Tested again from four different networks. Not working for me. > > Same in other web sites hosted by 1&1 (for example
www.legalveritas.es). All their IPv6 web sites are broken, every time I
need to access their web sites, need to disable IPv6, I know how to do
that, but regular folks not. > > tbit from 2001:df0:4:4000::1:115 to
2001:8d8:100f:f000::2d5 > server-mss 1420, result: pmtud-fail > app:
http, url: http://diskmakerx.com/ > [  0.010] TX SYN             64  seq
= 0:0            > [  0.286] RX SYN/ACK         64  seq = 0:1           
> [  0.286] TX                 60  seq = 1:1            > [  0.297]
TX                233  seq = 1:1(173)        > [  0.573]
RX                 60  seq = 1:174          > [  0.799] RX              
1480  seq = 1:174(1420)    > [  0.799] RX                 73  seq =
1421:174(13)    > [  0.799] RX               1480  seq = 1434:174(1420) 
> [  0.799] RX               1480  seq = 2854:174(1420)  > [  0.799] TX
PTB           1280  mtu = 1280 > [  0.799] RX               1480  seq =
4274:174(1420)  > [  0.799] RX               1480  seq = 5694:174(1420) 
> [  0.799] RX               1480  seq = 7114:174(1420)  > [  0.801]
RX               1480  seq = 8534:174(1420)  > [  0.809]
TX                 60  seq = 174:1          > [  0.821] RX              
1480  seq = 9954:174(1420)  > [  0.824] RX               1480  seq =
11374:174(1420) > [  1.628] RX               1480  seq = 1:174(1420)   
> [  1.629] TX PTB           1280  mtu = 1280 > [  3.288]
RX               1480  seq = 1:174(1420)    > [  3.288] TX PTB          
1280  mtu = 1280 > [  6.612] RX               1480  seq = 1:174(1420)   
> [  6.612] TX PTB           1280  mtu = 1280 > [ 13.252]
RX               1480  seq = 1:174(1420)    > > > > Regards, > Jordi > >
> -----Mensaje original----- > De: Mark Andrews <marka () isc org> >
Responder a: <marka () isc org> > Fecha: lunes, 21 de noviembre de 2016,
1:26 > Para: Carl Byington <carl () five-ten-sg com> > CC:
<jordi.palet () consulintel es>, <nanog () nanog org> > Asunto: Re: pay.gov
and IPv6 > >     >     In message
<1479686835.13553.4.camel () ns five-ten-sg com>, Carl Byington writes:
> On Sun, 2016-11-20 at 10:51 +0100, JORDI PALET MARTINEZ wrote:
> > For example, you will not get this working if you have a lower MTU
> > than 1.500, which is quite normal, not just for tunnels, but also
> > because the PPP/others encapsulation in many access links:
>
> > http://diskmakerx.com/
>
> curl -6 -v http://diskmakerx.com/
>
> That works here via an he.net tunnel. Perhaps 1and1 fixed something.
>
> >     And the advertised MSS was what?  On my box I'm seeing 1220 for
> >     IPv6 compared with 1460 for IPv4.  1220 shouldn't see PMTU problems.
>
> >     1460 on the other hand will cause problems as more clients are
> >     forced behind IPv4 as a service links.
>
> >     11:14:50.056215 IP 172.30.42.121.52280 > 217.160.0.214.80: Flags
> [S], seq 2115844511, win 65535, options [mss 1460,nop,wscale
> 4,nop,nop,TS val 538455715 ecr 0,sackOK,eol], length 0
> >     11:14:50.137770 IP6 2001:470:a001:4:c00d:3d8c:14e7:6de3.52282 >
> 2001:8d8:100f:f000::2d5.80: Flags [S], seq 4181372812, win 65535,
> options [mss 1220,nop,wscale 4,nop,nop,TS val 538455793 ecr
> 0,sackOK,eol], length 0
>
> >     Mark
>
>     > >     > >     -- >     Mark Andrews, ISC >     1 Seymour St., Dundas
Valley, NSW 2117, Australia >     PHONE: +61 2 9871 4742                
INTERNET: marka () isc org >     >     > > > >
********************************************** > IPv4 is over > Are you
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