Getting timeouts on TFTP on F15 as well as F14

[Frantisek Hanzlik]

Aaron Gray wrote:
> On 10 October 2011 23:31, Frantisek Hanzlik <franta at hanzlici.cz <mailto:franta at hanzlici.cz>>
> wrote:
> 
>     Aaron Gray wrote:
>     > On 10 October 2011 22:20, Frantisek Hanzlik <franta at hanzlici.cz
>     <mailto:franta at hanzlici.cz> <mailto:franta at hanzlici.cz <mailto:franta at hanzlici.cz>>>
>     > wrote:
>     >
>     >     Aaron Gray wrote:
>     >     ...
>     >     >
>     >     >     4) if You use firewall (iptables), You should load nf_conntrack_tftp module,
>     >     >     for tracking ephemeral ports. That means /etc/sysconfig/iptables-config should
>     >     >     contain line as:
>     >     >     ...
>     >     >     IPTABLES_MODULES="nf_conntrack_tftp"
>     >     >     ...
>     >     >     (other module is for NATting tftp connection)
>     >     >
>     >     >
>     >     > using localhost
>     >
>     >     loopback (lo interface) is subject to firewall rules too. And Your tcpdump
>     >     below show IP addresses 192.168.0.4 and 192.168.0.5 - they perhaps are not
>     >     at lo loopback interface?
>     >     Have You firewall active?
>     >
>     >
>     > I wrote a firewall rule :-
>     >
>     > -A INPUT -m state --state NEW -m udp -p udp --dport 69 -j ACCEPT
> 
>     Then You should have (best at beginning of filter table rules) rule:
> 
>     -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
> 
> 
> Okay.
>  
> 
> 
>     (and nf_conntrack_tftp module listed in "/etc/sysconfig/iptables-config",
>     as I wrote before). You must restart iptables after these changes.

Is nf_conntrack_tftp module loaded? You should obtain similar output:
# lsmod |grep tftp
nf_conntrack_tftp       3325  0
nf_conntrack           56162  4 nf_conntrack_tftp,nf_conntrack_ipv4,nf_conntrack_ipv6,xt_state


>     >     >     5) /var/log/messages should contain entries as:
>     >     >     Oct 10 20:28:32 ns xinetd[1908]: START: tftp pid=5315 from=192.168.1.22
>     >     >     Oct 10 20:28:42 ns xinetd[1908]: EXIT: tftp status=0 pid=5315 duration=10(sec)
>     >     >
>     >     >
>     >     > Oct 10 21:09:07 gold xinetd[13402]: Exiting...
>     >     > Oct 10 21:09:12 gold xinetd[13650]: xinetd Version 2.3.14 started with libwrap loadavg
>     >     > labeled-networking options compiled in.
>     >     > Oct 10 21:09:12 gold xinetd[13650]: Started working: 1 available service
>     >
>     >     There isn't nothing about that xinetd starts tftp daemon. Mentioned
>     >     "1 available service" is tftp?
>     >     This command show only tftp:
>     >
>     >     # grep '^[[:blank:]]*disable.*no' /etc/xinetd.d/*
>     >     /etc/xinetd.d/tftp:     disable = no
>     >
>     >
>     > I tested it and it is the only xinetd demon running
>     >
>     >
>     >     Next command display some similar at Your server?:
>     >     # netstat -a -n -p --ip|grep 69
>     >     udp        0      0 0.0.0.0:69 <http://0.0.0.0:69>           0.0.0.0:*      1595/xinetd

What netstat now displays? Is xinetd listening at udp 69 ??



>     This command has probably no output at Your server, because...
> 
>     >>     Can You post Your "/etc/xinetd.d/tftp" file?
>     >
>     > Attached.
> 
>     ... Your "/etc/xinetd.d/tftp" contains "disable = yes" line, thus
> 
> 
> sorry, don't know how that happened ? Its late here !

Here too... :)
Did You reload xinetd daemon after changes in "/etc/xinetd.d/tftp"?

> It still does not work with "disable = no"
> 
>     tftp service is disabled. You must change it to "disable = no" and
>     reload xinetd (using "service xinetd reload" or
>     "systemctl reload xinetd.service"). "/var/log/messages" tail
>     should indicate new service:
> 
>     Oct 11 00:25:10 franta xinetd[1556]: Starting reconfiguration
>     Oct 11 00:25:10 franta xinetd[1556]: Swapping defaults
>     Oct 11 00:25:10 franta xinetd[1556]: Reconfigured: new=1 old=0 dropped=0 (services)
> 
>     and above netstat command should display xinetd listening at
>     udp port 69
> 
> 
> Thanks for bearing with me on this.
> 
> Just tried rsync and that works fine so its not xinetd.

I understand maybe only partialy, sorry for my extrabad english.
What display "netstat -a -n -p|grep xinet" command?