I just got my friend's VPN connection dropped. He tried to upload some files for me. First, it seemed the connection was terminated around 5 minutes, and from the last tryout I logged the following.
Is the problem because of my Cisco ASA 5505 configuration, or is the problem at my friend's end? He's using Linksys's router with WLAN connection to his laptop, if this means anything here.
82.128.193.xxx is my friend's IP, while my Cisco sits at 82.128.189.xxx.
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Dropping the Diffie-Hellman (DH) group reduces the strength of the keys used for encryption, so dropping from group 5 (1536-bit) to group 2 (768-bit) would be a reduction of about half. RFC 3526 does suggest using a 1536 bit or larger key, so if your friend can adjust up you'd be much better off.
Group 2:
2^1024 - 2^960 - 1 + 2^64 * { [2^894 pi] + 129093 }
Group 5:
2^1536 - 2^1472 - 1 + 2^64 * { [2^1406 pi] + 741804 }
For more info check out RFC-2409 (the original IETF IKE definition) or RFC-3526 (the expanded version with AES modifications).
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by: erkki01Posted on 2009-08-25 at 13:11:08ID: 25181724
Here's my current configuration. Connection type used was L2TP, TRANS_ESP_AES-128_SHA.
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