It may be best to do two things. 1st would be to disable pings to and from the server at the router by putting in an ACL on the router. The second thing you'll want to do is block access to that machine via the router from any suspect IP's or IP blocks that you suspect might be attacking your machine. They already know it's there, so they're going to begin or continue to try to attack it now, so you'll want to block them from being able to access it now. Once you've done that, keep an eye on your machine for a while for any other possible attacks. Once they stop and nothing shows up for about 2 weeks it should be safe to remove the ACL's from the router, but continue to monitor it for a while longer just to be sure and add them back if nessisary.

At 11:36 PM 11/28/03 +0300, Marwan Sultan wrote:
Hello Tech.

  For the past few days, i had troubles connecting to my KIFCO server
  Kifco.net
  And at night around ( 23:30 GMT ) and the following hours i cannot
  connect at all, it connect for 1 second then everything lags,
  I can see slow connections and lagged ones.

  After all when im able to connect to the machine, I checked the dmesg log
  I found the follow :

Limiting closed port RST response from 268 to 200 packets per second
Limiting closed port RST response from 302 to 200 packets per second
Limiting closed port RST response from 296 to 200 packets per second
Limiting closed port RST response from 213 to 200 packets per second
Limiting closed port RST response from 272 to 200 packets per second

Which consider a PORTSCAN and an ATTACK.

 Also as I know from my friend on IRC DALnet network that dragons.dal.net
 is hosted in maxim, and just in this second its disconnected.
 Maybe because of an IRC server you have this attack?
 I had two IRC servers on DALnet in Past, and im familier with this trouble.
 anyhow, IRC is not my part of concern or who owns it.
 Kifco is my concern.
 Can you disable all PINGS from router to my server?
 Please can you update me and check this issue?

Your updating for me, is really appreciate it

Thank you.

--
Marwan Sultan
Network Administrator

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