On Mon, 12 Apr 1999, Roger Fischer wrote:

> >> 22:59:48.611916 max > max.badger1.net: icmp:
> mail.badger1.net unreachable - need to frag (mtu 552) (DF)
> >
> >Okay, I think these need to frag messages are the problem I think the
> >problem is that NAT gets a packet from the machine sending the mail,
> >then changes the source address to be your NetBSD machine's address.
> >It's about to send it out, but notices that it's bigger than your PPP
> >link's MTU (552 bytes) and the Don't Fragment (DF) bit is set. So, it
> >tries to send back a "need to fragment" message back, but it's already
> >changed the address on the packet and ends up sending the message to
> >itself instead of the machine actually sending the packet.
> >
> >I think a workaround for this would be to leave your PPP link's MTU at
> >the default 1500
> 
> Thanks Dave.  I set MTU back to 1500, and the mail went through.  It also fixed
> the problem loading an "excite" web page that I wa having trouble with.

Please send a pr with this info in it. This bug needs to be fixed, and by
filing a PR, you make it less likely for it to get dropped or forgotten.

Thanks!

Take care,

Bill