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Re: [Openvpn-users] icmp works, tcp not, tcp packets have incorrect checksums


  • Subject: Re: [Openvpn-users] icmp works, tcp not, tcp packets have incorrect checksums
  • From: harald.lampesberger@xxxxxxx
  • Date: Thu, 9 Mar 2006 10:42:12 +0100 (CET)
  • Importance: Normal

Jon, i just found out that this problem is not related to openvpn. The
xen-network between the VPN-Box and the Target is the cause of this
problem.


thanks for your help!

harald



> Den torsdag 9.mar kl. 9:59 skrev harald.lampesberger@xxxxxxx:
>
>> Hi Jon,
>>
>> thanks for the answer!
>>
>>
>>> Den onsdag 8.mar kl. 16:53 skrev harald.lampesberger@xxxxxxx:
>>>>
>
> [cuuuut]
>
>
>>>> From the client, I can ping the VPN-Box through 192.168.1.1 and
>>>> 10.0.0.2,
>>>> i can also ping the Target with 10.0.0.5. 10.0.0.5 can ping the
>>>> client and
>>>> all interfaces from the VPN-Box.
>>>
>>> How big ping packets have you tried with?
>>
>>
>> I just played with the ping packetsize and got some interesting
>> results.
>> When i try with the default size, everything is ok.
>>
>> Client ---> Target  OK
>> Target ---> Client  OK
>> Client ---> VPN-Box OK
>> VPN-Box ---> Client OK
>> Target ---> VPN-Box OK
>> VPN-Box ---> Target OK
>>
>>
>> ping -s 65507 (maximum size):
>>
>> Client ---> Target  no response
>> Target ---> Client  no response
>> Client ---> VPN-Box OK
>> VPN-Box ---> Client OK
>> Target ---> VPN-Box OK
>> VPN-Box ---> Target OK
>>
>> maybe this can be source of the problem.
>
> okay, not you try this:
> packets sizes from 1000 to 2000 in 100 byte increments.
> Once it stops working you go down to the last 1x00 that
> worked, and try with 10 byte increments until it doesnt work.
> Then you do the same with 1 byte increments.
>
>
>
> JonB
>
>
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