Might this be an ICMP issue? Can you telnet into port 25 of the server by
name? How about by IP?
Charles Edge, MCSE, ACSA, CCA, CCNA, FM8CD, Net+/Sec+
Partner :: Three18 :: www.318.com :: 310.581.9500
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On 6/29/06 12:22 AM, "Wolfram Stebel" <email@hidden>
wrote:
> Am 29.06.2006 6:55 Uhr schrieb "Charles Edge" unter <email@hidden>:
>
>> Hi Charles,
> thanks for answering.
>> Are you sure you're not actually encountering a DNS issue? Can you hit your
>> mail server by IP? If you can't access via IP or DNS then I'd take a look
> I can connect via l2tp and pptp to my server.
> But when i try to ping one of my mailservers (ISP's) i.e. "smtp.1und1.com"
> ping hangs as long as the connection is held.
>
> Se this, ping 8-17 are not transmitted during l2tp connection:
> [erde:~] Wolfram% ping smtp.1und1.com
> PING smtp.1und1.com (212.227.15.129): 56 data bytes
> 64 bytes from 212.227.15.129: icmp_seq=0 ttl=57 time=55.956 ms
> 64 bytes from 212.227.15.129: icmp_seq=1 ttl=57 time=58.416 ms
> 64 bytes from 212.227.15.129: icmp_seq=2 ttl=57 time=55.964 ms
> 64 bytes from 212.227.15.129: icmp_seq=3 ttl=57 time=55.707 ms
> 64 bytes from 212.227.15.129: icmp_seq=4 ttl=57 time=57.701 ms
> 64 bytes from 212.227.15.129: icmp_seq=6 ttl=57 time=54.772 ms
> 64 bytes from 212.227.15.129: icmp_seq=7 ttl=57 time=59.653 ms
> 64 bytes from 212.227.15.129: icmp_seq=18 ttl=57 time=55.186 ms
> 64 bytes from 212.227.15.129: icmp_seq=19 ttl=57 time=57.148 ms
> 64 bytes from 212.227.15.129: icmp_seq=20 ttl=57 time=57.176 ms
> 64 bytes from 212.227.15.129: icmp_seq=21 ttl=57 time=54.990 ms
> 64 bytes from 212.227.15.129: icmp_seq=22 ttl=57 time=58.926 ms
> 64 bytes from 212.227.15.129: icmp_seq=23 ttl=57 time=56.011 ms
> 64 bytes from 212.227.15.129: icmp_seq=24 ttl=57 time=58.003 ms
> ^C
> --- smtp.1und1.com ping statistics ---
> 25 packets transmitted, 14 packets received, 44% packet loss
> round-trip min/avg/max/stddev = 54.772/56.829/59.653/1.488 ms
>
>> at the authentication you're using. We've seen issues with how secure
>> protocols react to having their packets encapsulated by L2TP. Then the
>> question would become do the issues persist with PPTP. This doesn't mean
>> you need to switch to a different VPN protocol but rather that you are
>> isolating whether it is an issue with the VPN protocol conflicting with your
>> mail authentication protocol. Once you've isolated that then you will
>> better be equipped to troubleshoot the issue in L2TP.
>>
>> Hope this helps,
> Partly, i still don't know what to do... :-)
>
> In server admin:
> In the "client information" of my vpn config i have set the DNS-server of my
> ISP. Might this one not be reachable when tunneling? Removing it doesn't
> help.
> Do i need a network routing definition? I have none at the moment.
>
> Wolfram
>
>
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