isakmpd NAT-Traversal - testers wanted

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02-18-2008, 07:05 AM

Hakan Olsson

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isakmpd NAT-Traversal - testers wanted

Support for NAT-Traversal in isakmpd was added just recently (yesterday or
so). The support is for ESP-tunnels only, not AH or transport mode.

So far, it has only been tested between various OpenBSD/isakmpd boxes, and
I would appreciate if people could try to test this against other vendors
and mail me the results.

To test, first update isakmpd to -current, anoncvs should have the sources
by now.

There is no special isakmpd configuration required to activate NAT-T, it's
all automatic. However, you need to run "sysctl net.inet.esp.udpencap=1"
on both sides, as well as permitting UDP port 4500 in addition to the
normal 500.

If it does not work, mail me a description of the problem, the last 2-300
lines from 'isakmpd -d -DA=90 -L', and the output from 'tcpdump -nvr
/var/run/isakmpd.pcap'. (You'll probably want to update tcpdump as well.)

Thanks,
Håkan

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isakmpd NAT-Traversal - testers wanted