netfilter buglog - Apr 2003 - [Bug 79] New: iptables slow without DNS

https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=79

           Summary: iptables slow without DNS
           Product: iptables userspace
           Version: 1.1.2
          Platform: All
        OS/Version: RedHat Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: iptables
        AssignedTo: laforge@netfilter.org
        ReportedBy: dsinger@crimecommission.nsw.gov.au
                CC: netfilter-buglog@lists.netfilter.org


version v1.2.8
Running on Redhat 8.0

I am running iptables on what is primarly a syslog server.
The server does not have access to DNS.

Found that unless I add an entry in hosts file for the source address that is 
hitting the syslog server that there is a long delay before log entries are 
written to disk.

It is also noticeable when you ssh to the syslog server that there is a long 
wait time to receive the password prompt.

Is iptables attempting to do a reverse DNS lookup?
Can this be disabled?

Thanks, David



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