I'm using FreeBSD 5.21 with a dialup modem, and I'm having problem
uploading files and sending emails with attachments through the
Fastmail.fm mail service - the connections just time-out. Ordinary web
browsing and short text emails work normally with Fastmail. File
uploads to other sites work and file uploads to Fastmail works from
Windows 98.
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I'm guessing that this is a path MTU discovery blackhole, since if I set
sysctl net.inet.tcp.sendspace=400 the problem goes away. (I presume
that net.inet.tcp.path_mtu_discovery: 1 means that path MTU discovery
is already turned-on by default.)
What the correct way to deal with this? Should I just play around with
net.inet.tcp.sendspace?
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