xinetd.d listening twice on port 69

[Mark Sargent]

Andy Green wrote:

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> Mark Sargent wrote:
> | Andy Green wrote:
>
> |> I would find it a nice explanation if it is a bug, because my
> |> understanding of how the  sockets work will not allow this scenario 
> of a
> |> single process binding two sockets to the same port and 
> listen()-ing to
> |> both.  Of course my understanding can easily be broken and often is 
> ;-)
>
> | below is the results. I have no idea what I'm looking at/for.
>
> | xinetd    5105           root    8u     IPv4       9913
> | UDP *:tf tp
> | xinetd    5105           root    9u     IPv4       9914
> | UDP *:tf tp
>
> lsof shows you all the "file" type assets a process has open, sockets
> being "files" for this purpose.  The lines above show that the xinetd
> process 5105 does indeed hold two IPv4 UDP sockets listening on the tftp
> port and so it's presumably not a netstat bug.
>
> Maybe it's worth copying your version of
>
> [root at server html]# cat /etc/xinetd.d/tftp
> # default: off
> # description: The tftp server serves files using the trivial file
> transfer \
> #       protocol.  The tftp protocol is often used to boot diskless \
> #       workstations, download configuration files to network-aware
> printers, \
> #       and to start the installation process for some operating systems.
> service tftp
> {
> ~        socket_type             = dgram
> ~        protocol                = udp
> ~        wait                    = yes
> ~        user                    = root
> ~        server                  = /usr/sbin/in.tftpd
> ~        server_args             = -s /tftpboot
> ~        disable                 = no
> ~        per_source              = 11
> ~        cps                     = 100 2
> ~        flags                   = IPv4
>
> ... just in case.  And really just in case
>
> cd /etc/xinetd.d
> grep tftp *
>
> - -Andy
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Hi All,
ok, I copied the tftp file from xinetd.d to another location and 
rebooted. Guess what, xinetd is still listening on port 69 udp. This is 
weird. I can't get my head around it, eh. Cheers.

Mark Sargent.