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3. Troubleshooting: Questions and Answers
3.1. Question: How can I keep the settings through a reboot?
Answer: Whether you are using BSD-style or SysV-style (Redhat™ for example) init, you can always include it in /etc/rc.d/rc.local. Here's what I have on my SysV init system (Redhat™ 3.0.3 and 4.0):
My /etc/rc.d/rc.local: (edited to show the relevant portions)
#setting up IP alias interfaces echo "Setting 172.16.3.1, 172.16.3.10, 172.16.3.100 IP Aliases ..." /sbin/ifconfig lo 127.0.0.1 /sbin/ifconfig eth0 up /sbin/ifconfig eth0 172.16.3.1 /sbin/ifconfig eth0:0 172.16.3.10 /sbin/ifconfig eth0:1 172.16.3.100 #setting up the routes echo "Setting IP routes ..." /sbin/route add -net 127.0.0.0 /sbin/route add -net 172.16.3.0 dev eth0 /sbin/route add -host 172.16.3.1 eth0 /sbin/route add -host 172.16.3.10 eth0:0 /sbin/route add -host 172.16.3.100 eth0:1 /sbin/route add default gw 172.16.3.200 # |
3.2. Question: How do I set up the IP aliased machine to receive e-mail on the various aliased IP addresses (on a machine using sendmail)?
Answer: Create (if it doesn't already exist) a file called, /etc/mynames.cw,for example. The file does not have to be this exact name nor in the /etc directory.
In that file, place the official domain names of the aliased IP addresses. If these aliased IP addresses do not have a domain name, then you can place the IP address itself.
The /etc/mynames.cw might look like this:
# /etc/mynames.cw - include all aliases for your machine here; # is a comment domain.one.net domain.two.com domain.three.org 4.5.6.7 |
In your sendmail.cf file, where it defines a file class macro Fw, add the following:
################## # local info # ################## # file containing names of hosts for which we receive email Fw/etc/mynames.cw |
That should do it. Test out the new setting by invoking sendmail in test mode. The following is an example:
ganymede$ /usr/lib/sendmail -bt ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter < ruleset> < address> > 0 me@4.5.6.7 rewrite: ruleset 0 input: me @ 4 . 5 . 6 . 7 rewrite: ruleset 98 input: me @ 4 . 5 . 6 . 7 rewrite: ruleset 98 returns: me @ 4 . 5 . 6 . 7 rewrite: ruleset 97 input: me @ 4 . 5 . 6 . 7 rewrite: ruleset 3 input: me @ 4 . 5 . 6 . 7 rewrite: ruleset 96 input: me < @ 4 . 5 . 6 . 7 > rewrite: ruleset 96 returns: me < @ 4 . 5 . 6 . 7 . > rewrite: ruleset 3 returns: me < @ 4 . 5 . 6 . 7 . > rewrite: ruleset 0 input: me < @ 4 . 5 . 6 . 7 . > rewrite: ruleset 98 input: me < @ 4 . 5 . 6 . 7 . > rewrite: ruleset 98 returns: me < @ 4 . 5 . 6 . 7 . > rewrite: ruleset 0 returns: $# local $: me rewrite: ruleset 97 returns: $# local $: me rewrite: ruleset 0 returns: $# local $: me > 0 me@4.5.6.8 rewrite: ruleset 0 input: me @ 4 . 5 . 6 . 8 rewrite: ruleset 98 input: me @ 4 . 5 . 6 . 8 rewrite: ruleset 98 returns: me @ 4 . 5 . 6 . 8 rewrite: ruleset 97 input: me @ 4 . 5 . 6 . 8 rewrite: ruleset 3 input: me @ 4 . 5 . 6 . 8 rewrite: ruleset 96 input: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 96 returns: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 3 returns: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 0 input: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 98 input: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 98 returns: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 95 input: < > me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 95 returns: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 0 returns: $# smtp $@ 4 . 5 . 6 . 8 $: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 97 returns: $# smtp $@ 4 . 5 . 6 . 8 $: me < @ 4 . 5 . 6 . 8 > rewrite: ruleset 0 returns: $# smtp $@ 4 . 5 . 6 . 8 $: me < @ 4 . 5 . 6 . 8 > > |
Notice when I tested me@4.5.6.7, it delivered the mail to the local machine, while me@4.5.6.8 was handed off to the smtp mailer. That is the correct response.
You are all set now.
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Generated: 2007-01-26 17:58:18