I am having some difficulties with multiple Nortel VPN clients behind a Gnatbox GB-1000 unit. I've scoured Gnatbox's knowledgebase and various other resources and have not found any solid information. Hopefully someone on the list has run into this problem or has some good suggestions.
Looking through Nortel's documentation yielded a known issue with NAT traversal connection failure which essentially explains that multiple VPN connections behind a NAT firewall will lead to unreliable connection with the Nortel Contivity client.
Has anyone had problems like this? Has anyone come up with a solution or at least a workaround. I am open to suggestions.
If using multiple IP's on the Nortel box is impossible, you could try doing the same thing on your end. Assign multiple IP's to your GB-1000 and use static address mappings to have each VPN session appear to originate from a different IP.
FYI, the GNAT Box VPN client has the same issue with NAT; I've heard rumours that Cisco has a client that will work around this problem but I haven't used it myself.
Maarten Vink
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