On Mon, 2 Jul 2007, Phil Dibowitz wrote:
On Mon, Jul 02, 2007 at 09:16:57PM +0200, Krzysztof Oledzki wrote:
On Mon, 2 Jul 2007, Phil Dibowitz wrote:
On Mon, Jul 02, 2007 at 07:04:12PM +0200, Andreas Steinmetz wrote:
Jan Engelhardt wrote:
Do you really need clamping? It's a hack, since T
On Mon, 2 Jul 2007, Phil Dibowitz wrote:
On Mon, Jul 02, 2007 at 07:04:12PM +0200, Andreas Steinmetz wrote:
Jan Engelhardt wrote:
Do you really need clamping? It's a hack, since TCP should do MSS negotiation
itself. (Of course it may happen that some routers are broken.) But usually not
for
On Mon, Jul 02, 2007 at 09:16:57PM +0200, Krzysztof Oledzki wrote:
>
>
> On Mon, 2 Jul 2007, Phil Dibowitz wrote:
>
>> On Mon, Jul 02, 2007 at 07:04:12PM +0200, Andreas Steinmetz wrote:
>>> Jan Engelhardt wrote:
Do you really need clamping? It's a hack, since TCP should do MSS
negotiatio
On Mon, Jul 02, 2007 at 07:04:12PM +0200, Andreas Steinmetz wrote:
> Jan Engelhardt wrote:
> > Do you really need clamping? It's a hack, since TCP should do MSS
> > negotiation
> > itself. (Of course it may happen that some routers are broken.) But usually
> > not
> > for incoming packets.
>
> Y
Jan Engelhardt wrote:
> Do you really need clamping? It's a hack, since TCP should do MSS negotiation
> itself. (Of course it may happen that some routers are broken.) But usually
> not
> for incoming packets.
You never know when you hit ICMP blackholes, broken routers and other
evil things. Bett
Patrick McHardy wrote:
> Its possible that one of your ISPs is doing clamping. You could
> check on ppp0 if thats the case. Or maybe for some reason the
> PMTU value for the internal host is smaller than 1500. You can
> check that by doing "ip route get ".
>
>
Oh well, thew fun with ISPs. Same p
On Jun 29 2007 13:09, Andreas Steinmetz wrote:
>
>There seems to be a problem with mss to pmtu clamping for incoming syn
>packets on reply to an outgoing connection on a ppp interface. The mss
>of the outgoing syn packets is always always clamped to the pmtu, I did
>check this with a target host I
Patrick McHardy wrote:
> Andreas Steinmetz wrote:
>> Patrick McHardy wrote:
>>
>>> - assuming you have ethernet internally, the PMTU from your router
>>> to the internal hosts is 1500, so it won't do any clamping.
>>>
>>
>> Yep, internal PMTU is 1500, still the incoming packets are clamped to
>> 14
Andreas Steinmetz wrote:
> Patrick McHardy wrote:
>
>>- assuming you have ethernet internally, the PMTU from your router
>>to the internal hosts is 1500, so it won't do any clamping.
>>
>
>
> Yep, internal PMTU is 1500, still the incoming packets are clamped to
> 1452 on the one line and not cla
Patrick McHardy wrote:
> Andreas Steinmetz wrote:
>> Patrick McHardy wrote:
>>
>>> Andreas Steinmetz wrote:
>>>
[...]
The tcpdump on the client shows that the mss of the incoming syn reply
packet is *NOT* clamped to the ppp interface mtu.
>>>
>>> You forgot to mention *how* you're cl
Andreas Steinmetz wrote:
> Patrick McHardy wrote:
>
>>Andreas Steinmetz wrote:
>>
>>>[...]
>>>The tcpdump on the client shows that the mss of the incoming syn reply
>>>packet is *NOT* clamped to the ppp interface mtu.
>>
>>
>>You forgot to mention *how* you're clamping the MSS. Using
>>TCPMSS? Do
Patrick McHardy wrote:
> Andreas Steinmetz wrote:
>> There seems to be a problem with mss to pmtu clamping for incoming syn
>> packets on reply to an outgoing connection on a ppp interface. The mss
>> of the outgoing syn packets is always always clamped to the pmtu, I did
>> check this with a targe
Andreas Steinmetz wrote:
> There seems to be a problem with mss to pmtu clamping for incoming syn
> packets on reply to an outgoing connection on a ppp interface. The mss
> of the outgoing syn packets is always always clamped to the pmtu, I did
> check this with a target host I do have access to. T
There seems to be a problem with mss to pmtu clamping for incoming syn
packets on reply to an outgoing connection on a ppp interface. The mss
of the outgoing syn packets is always always clamped to the pmtu, I did
check this with a target host I do have access to. The incoming syn
reply to such a p
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