Berkeley CSUA MOTD:Entry 26184
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2002/10/15 [Computer/SW/Mail] UID:26184 Activity:high
10/14   I recently setup a new machine as my mail server. I want my old
        machine to forward all pop/imap/smtp requests to my new server. I can
        do this trivially with a persistent ssh connection, but is there a
        better / more robust way to do this?
        \_ look at the rdr rule in ipnat.
        \_ You're *supposed* to be using dns and thus only need to change a
           few dns records, not screw with ipnat or persistent ssh or anything
           kludgey like that.
           \_ If the hostname on client configurations has to stay the same
              for some reason?  Ipnat is not kludgey.  -John
              \_ Then you let it stay the same.  DNS is still the answer.
                 \_ If you want to forward *ALL* pop/imap/smtp connections
                    then DNS won't help you. What if some clients use hard
                    coded IPs? ipnat rdr is the only complete solution.
                    If you can't do ipnat, set up port forwarding on your
                    router (most ciscos can do this).
                    \_ hard coded IPs?  Who is *that* stupid?  Yes if someone
                       was *that* stupid then you need stupid kludges like
                       ipnat rdr but better to switch the clients to dns
                       names like they should have been in the first place.
                       And fire whatever incompetent boob put IPs in there.
ERROR, url_link recursive (eces.Colorado.EDU/secure/mindterm2) 2025/05/24 [General] UID:1000 Activity:popular
5/24    

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