At 21:33 27.10.2002, Wolfgang Pfeiffer said:
--------------------[snip]--------------------
>Not being sure whether I got what you mean:
>
>But this port 113 connection attempt came when I used sendmail to send
>my message directly to the redhat mail server, thus bypassing my
>ISP's machines ... I'm not worried about this (or should I ? ...),
>because at this instance I could relate this connect attempt to
>something that was initiated by me (i.e. by sending my mail)...
--------------------[snip]--------------------
AFAIK snedmail tries to identd to the sending host when you connect to it
at port 25. Since this identd request is normally not mandatory it doesn't
harm if you block it, sendmail should work without this anyway.
OTOH it's necessary that your FW doesn't DROP port 113 but rather REJECT
it, otherwise you (or any other host) might suffer from quite long timeouts
while trying to identd to your machine.
Nothing really to worry about in this case, IMHO. Just let your iptables
REJECT port 113, don't drop it...
BTW, I'm _dropping_ all NetBios ports in my firewall :)
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