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ports
before I connect my firewall to the internet, i ran a little test,
I've telnet each and every port on the firewall from inside,
and saw which were open and on which connection was refused.
between the ports which not refused connection i found many ports,
but 3 of them did not apear in /etc/srvices. the ports are : 874, 901,
1251
any ideas what those ports do ?
btw: if i want to use ipfwadm to disable connections to some ports
which range should i choose, so it will not be possible to connect to
me from outside, but it will give me full connectivity to the internet.
( i know i should exclude some ports if i want mail etc..., but that's
not the
issue, i'll open these ports manually)
my biggest not refusing connection is port 2049 (nfs), is closing ports
0..2049 from outside is enough ? will it disable me to connect outside
( i.e. by telnet,ftp,http etc, connections opened by me )
regards
Erez
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- From: Glynn Clements <glynn@sensei.co.uk>