don't understand some firewall log activities

Posted on 2001-06-04
Medium Priority
Last Modified: 2013-11-16
this is the screen capture from the checkpoint firewall log viewer. Please take a look first


I always find that these two hosts connect my firewall thru service is domain-udp.
Actually these two hosts is from our ISP

What are they doing ?
Question by:adrianmak
  • 2
LVL 12

Expert Comment

ID: 6154773
-Looks to me to be simple DNS traffic. port 53 UDP protocol 7. You cannot resolve sites from the lan with regular DNS queries..
LVL 12

Expert Comment

ID: 6154774
-Looks to me to be simple DNS traffic. port 53 UDP protocol 7. You cannot resolve sites from the lan with regular DNS queries..

Accepted Solution

Haho earned 20 total points
ID: 6159094
yes it does seem like DNS query packets..
DNS query uses UDP but DNS zone transfer uses TCP.
Is your servers a DNS server.. that would explain your ISP querying your server for xxx.com because your server is the authorative DNS server for xxx.com.


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