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Disable DNS Lookup

Posted on 2008-10-19
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Last Modified: 2013-12-16
Hi,

I am using vsftpd & experience high tarffic on udp port 53 which is DNS, I beleive this is when a log is writen to audit.log by the vsftpd. When i stop teh ftp server there is no more DNS traffic.
How can i disable the DNS lookup ? ther is no option through vsftpd & its not the syslog.
Can either be the PAM or some other OS options,

Danny
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Question by:wefi
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by:leonjs
leonjs earned 200 total points
ID: 22753076
Quick question, are you running vsftpd on the inside network? Is it communicating with other machines in the inside network or is it communicating with machines outside the network.

If vsftpd is doing transactions with machines outside the network we can put a statement in the firewall to not all this kind of traffic from that host.

If the traffic is inside the network only in most cases it will never hit the firewall and you can make a similar change to your switches.

I am not familiar with vsftpd to say whether or not it has settings in the conf file for dns but i do think you could take out the nameservers in /etc/resolv.conf then this traffic will not be a issue anymore, assuiming this machine does not need dns at all.
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wefi earned 0 total points
ID: 22753108
Commenting out is a nic eworkaround which i can use but i was thinking there is a way to stop this.
I would need resolving at some point.

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by:wefi
ID: 22753170
h
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