Hello! Recently I discovered something weird on my system: Seemingly every minute, it does DNS lookups for its own host names, which of course fail because I'm not in my ISP's DNS (and don't even have a dynamic IP, plus I'm on a local network with a firewall). Here is an extract from tcpdump: <<< 21:07:46.590705 arp who-has SebastianL2 tell 192.168.0.1 21:07:46.590740 arp reply SebastianL2 is-at 0:0:cb:6:1:27 21:07:46.591361 SebastianL2.32805 > dns03.btx.dtag.de.domain: 35559+ PTR? 1.0.168.192.in-addr.arpa. (42) (DF) 21:07:46.660347 dns03.btx.dtag.de.domain > SebastianL2.32805: 35559 NXDomain 0/1/0(119) (DF) 21:08:01.461009 SebastianL2.32805 > dns03.btx.dtag.de.domain: 36563+ AAAA? SebastianL2. (29) (DF) 21:08:01.531739 dns03.btx.dtag.de.domain > SebastianL2.32805: 36563 NXDomain 0/1/0(104) (DF) >>> I don't know much about tcpdump; all I can tell is that something weird is going on. I have a feeling it might be exim because it is run in a cron job that somehow executes every minute, so that would obviously be my next question: If it's exim, what could be the reason there? I've attached exim.conf; I only replaced my smarthost user and password with something generic. Here is my /etc/hosts file, in case something is wrong with it: <<< 127.0.0.1 localhost SebastianL2 192.168.0.5 SebastianL2 192.168.2.2 SebastianL2 # The following lines are desirable for IPv6 capable hosts # (added automatically by netbase upgrade) ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts >>> There's also some other issue I noticed with exim, but I don't want to start a new mail because it's really minor and I already attached my exim.conf in this mail. The "Sender" field of all my emails seems to be terminated by three commas. You should be able to see it in this mail, unless it gets removed on the way. If you know why, please tell me. I'm using Sylpheed to send mail directly through exim. I'm using Debian unstable. Please CC me because I'm not subscribed to the list. If this is the wrong list to ask this stuff, or if I should file a bug report against exim or something else, please tell me. I may also easily be overlooking something as I'm somewhat new to the Unix/Linux world. Thanks a lot in advance! -- Sebastian Reichelt
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