Re: Mac OS X VPN client and UDP 407
Re: Mac OS X VPN client and UDP 407
- Subject: Re: Mac OS X VPN client and UDP 407
- From: Justin Walker <email@hidden>
- Date: Tue, 9 Dec 2003 15:34:56 -0800
On Tuesday, December 9, 2003, at 03:09 PM, Marc Epard wrote:
on 12/9/03 4:04 PM, Justin Walker wrote:
Do you have a firewall engaged? I'm not sure it matters, but that can
sometimes cause funky behavior.
If there's a firewall involved, it's not one we know about. We're now
pretty sure it has to do with sending two datagrams in a row --
whichever
one gets sent first makes it, the second one doesn't, regardless of
destination port number. We have assertions all over the place and
nothing
is returning an error. We've used netstat to watch the statistics for
the
VPN interface and it isn't indicating any errors. The second one just
doesn't appear at the destination.
The evidence for the 'two datagrams' theory sounds convincing. You
should file a bug report, in any case.
Have you tried "sniffing" the interfaces to see what happens when you
think the packets should be going out? I don't know that 'tcpdump'
will work on the VNP interface, and can't test it right now, but it's
worth a shot. Having a (non-promiscuous) tcpdump on the VNP interface
and on the real (physical) interface carrying the tunnel may shed some
light - at least it will tell you whether data is sent, if not what
data is begin sent.
Someone with a bit more experience debugging this kind of thing may be
able to help [nudge, nudge; wink, wink].
Regards,
Justin
--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | When LuteFisk is outlawed
| Only outlaws will have
| LuteFisk
*--------------------------------------*-------------------------------*
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