DHCP management, port number

  • Thread starter Thread starter Arif Bilge Yorgan
  • Start date Start date
A

Arif Bilge Yorgan

hi,

My server is windows 2000 server. and the problem is TCP/IP filtering
& DHCP.
DHCP service starts successfuly.
But when open admistrative tools - dhcp; i get "Can not find DHCP
server" message.

When i disable tcp/ip filtering, there is no problem and i can connect
to DHCP.
But which TCP port is required for this connection. All UDP ports are
open in my settings.
I tried TCP 67, TCP 53.

What i know is: DHCP listens at UDP 67.

Does anybody knows the required port?
 
Just a heads up if your using nat in rras config it will break setting
filters on the ethernet. I never have been able to get filtering
to work correctly even on NT4.0 it always seemed to interfere
with Intel's device drivers especially if priority Q tagging was enabled.
 
I've never been a fan of that type of filtering (deny all, then allow) on
the LAN anyway, there are just too many things to "break". That kind of
filtering is great at the network edge where the LAN meets the
Internet,...but on the LAN itself, between the subnets, I would rather see
the "allow all, then deny" approach on the LAN where only specific things
are blocked (if legitamently justified) while allowing everything else. I
guess another way to look at it would be to use the "paranoia filtering" at
the network edge and do "conservative filtering" between the LAN subnets.

On our LAN, I am very restrictive at the "edge", but I don't do any Layer 3
or 4 filtering between LAN segments,...there are just too many other better
and more effective ways in to secure resources my opinion.
 
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