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John
John A. Sullivan III wrote:
Hello, all. We are seeing some bizarre behavior with our Windows
OpenVPN clients. We are not seeing the same behavior in the Linux
clients. Our setup is an OpenVPN gateway running openswan connecting to
other offices via openswan. I am just now beginning to peruse the more
obscure configuration settings and do some extensive testing but, if
anyone knows the answer off the top of their head, it will save me many
hours.
Whenever the windows client accesses a station in one of the offices,
i.e., across the openswan VPN, an entry for that station is added to the
Windows routing table. Although that is surprising, it would not be too
bad except that the MTU on the route is set to 576!
Did you disable PMTU discovery on Windoze? The reduced MTU size could be
one of the indications. The surprising thing is, how else would the
windows client know that his OpenVPN connection is futher tunneled
through an OpenSwan connection?
The result is
massive packet fragmentation.
:-) No surprise
cheers
Erich
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