Do we need to enable NAT -T on Local and Remote Firewalls for the below sce

Unanswered Question
Dec 1st, 2008

Hi ,

I have IPSEC configured between local end -Cisco PIX 515E & Remote end device - Nortel VPN box . Users from Local end use VPN

to access Remote end applciations. But I am facing issues like VPN disconnections ( 10 users out of 30) intermittently. After i perform clear all the sessions from Cisco PIX firewall users who are facing problem are able to connect back to the VPN with out any issues.

My Network :-

user PC ----> Coreswitch--> Netscreen Internal Firewall ----> Cisco PIX External firewall 6.2OS ver----> ISP Provider -------> Remote end Nortel VPN.

When we checked with our vendor Cisco theya re suggesting us to enable NAT-T between our Internal Firewall & Remote VPN to overcome this issue.

Please let us know do we need this option to enable. Also let me know other possibilities for causing this issue.

Thanks and Regards,

Akber Mirza.

I have this problem too.
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