Howdy, all. Adelphia -- God bless them -- has nixed my in-bound port 25, so I can no longer receive e-mail on this account. Which is highly annoying.
Ya its getting pretty insane. choiceone.net is dropping _all_ ICMP on their backbone. This breaks connectivity checking, MTU discovery, as well as actually _increasing_ the amount of traffic on the wire because type 3's are no longer being returned. Its also made them a choice address space to spoof for SYN attacks (no returning ICMP error means the connection queue gets tied up for over a minute rather than 50 ms or so). I used to get each of my public IP addresses spoofed about once every five days. Now each legal IP is getting spoof 30+ per day. Of course this also sucks down additional bandwidth. :(
In summary, I can no longer receive SMTP, so I'm looking for:
some magic iptables recipe to re-direct port 25 from machine a (1.2.3.4)
to machine b (3.4.5.6).
I've done this type of thing to make Squid run transparently. Something like:
iptables -t nat -A PREROUTING -p tcp -d 1.2.3.4 --dport 25 -j REDIRECT --to-destination 5.6.7.8:10025
Should work for you (check the syntax, that's off the top of my head). Problem is someone else has to run this command (from the 1.2.3.4 network) to get the traffic redirect to your network (5.6.7.8).
I've noticed a ton of people have jumped in on this thread so if you are all set, then cool. If not, I can give you a free mail account on spam-free-zone.net, or even host mail for you and give you an HTML or SSH connection to retrieve it. I don't do hosting (sold my ISP over a year ago), but would be happy to be a short term solution for you till you can get something else going.
If you are interested, post back off list.
Cheers all, C
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