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Old 06-10-2003, 10:47 PM   #1
Registered: May 2003
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help with tftp please


I am using red hat 8 server hosting my own web and mail server.

I am also a linux newbie with lots of questions.

However, the one i will ask now is the following:

I ran Languard on my server and it is telling me that i have port 69 tftp open and to comment out tftp from /etc/inetd.conf file and then restart it.

The problem i face is this, i have edited the file and there is no tftp in it. The file has got nothing in it apart from one line i put in so that my windows 2000 workstation could access pop3 from the linux box.

My question is - where is languard getting this tftp port open from?

In the meantime i have put the following in my iptables to stop the port -

iptables -A INPUT -p udp --dport 69 -j DROP

Any ideas please?

Old 06-11-2003, 02:27 PM   #2
Registered: May 2002
Location: AK - The last frontier.
Distribution: Red Hat 8.0, Slackware 8.1, Knoppix 3.7, Lunar 1.3, Sorcerer
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In /etc/xinetd.d/tftp change/add a line that says disable=yes. And then..
/sbin/service xinetd restart

inetd has been replaced by the more powerful and secure xinetd and hence the configuration files have changed.
Old 06-11-2003, 02:32 PM   #3
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My question is - where is languard getting this tftp port open from?

TCP and UDP ports can be linked to services, the IANA maintains a list of those, on your box look in /etc/services. Scanners can use lists like that to look up which port belongs to which service. Nmap for instance comes with a list similar to /etc/services, but extended with several more ports. LAN-Guard does the same, look up a port in a list. This doesn't mean "tftp" is running on that port, but it is the port trivial ftp uses to run on.

To check if something is running on the port try "netstat -A inet -anp | grep ".*:69"". This would give you the name, process ID, protocols and port. If it returns no results, nothing is running on the port. Btw, Tftp uses both UDP and TCP port 69. If you want to avoid specifying all ports to block, see if a default policy of "drop" is more effective. Then you'll only have to specify the ports you need to use.
Old 06-11-2003, 05:37 PM   #4
Registered: May 2003
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thanks everyone, i will try these today and see how i go


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