Re: udp port 69 (tftp) unreachable

Hi Venketesh,


Take a look at this & advice me...

[root@localhost root]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
RH-Lokkit-0-50-INPUT  all  --  anywhere
anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
RH-Lokkit-0-50-INPUT  all  --  anywhere
anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain RH-Lokkit-0-50-INPUT (2 references)
target     prot opt source               destination
ACCEPT     udp  --  anywhere             anywhere
     udp spts:bootps:bootpc dpts:bootps:bootpc
ACCEPT     udp  --  anywhere             anywhere
     udp spts:bootps:bootpc dpts:bootps:bootpc
ACCEPT     all  --  anywhere             anywhere
REJECT     tcp  --  anywhere             anywhere
     tcp dpts:0:1023 flags:SYN,RST,ACK/SYN reject-with
icmp-port-unreachable
REJECT     tcp  --  anywhere             anywhere
     tcp dpt:nfs flags:SYN,RST,ACK/SYN reject-with
icmp-port-unreachable
REJECT     udp  --  anywhere             anywhere
     udp dpts:0:1023 reject-with icmp-port-unreachable
REJECT     udp  --  anywhere             anywhere
     udp dpt:nfs reject-with icmp-port-unreachable
REJECT     tcp  --  anywhere             anywhere
     tcp dpts:x11:6009 flags:SYN,RST,ACK/SYN
reject-with icmp-port-unreachable
REJECT     tcp  --  anywhere             anywhere
     tcp dpt:xfs flags:SYN,RST,ACK/SYN reject-with
icmp-port-unreachable
[root@localhost root]#


Thanks,
-Mike.

>From: Venkatesh Krishnamurthi <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: udp port 69 (tftp) unreachable
>Date: Wed, 7 May 2003 11:12:28 -0700 (PDT)
>
>Hi,
>
>   Do you have the firewall enabled?  What does "iptables -L" show?
>
>Venkatesh
>
> >
> > Hi,
> >
> > When I do tftp from my TFTP client (Target board running YAMON) it 
>fails.
> > The TFTP server is configured on a stand-alone PC running RH Linux 9.
> >
> >
> > Info. about the protocols on the Host PC:
> > ---------------------------------
> >
> > [root@localhost root]# lsof -c x -a -i
> > COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
> > xinetd 1757 root 5u IPv4 2205 TCP localhost.localdomain:1025 (LISTEN)
> > xinetd 1757 root 6u IPv4 2208 UDP *:tftp
> >
> >
> >
> > Captured using $ tcpdump -n (while tftp client was actively trying)
> > -----------------------
> > 20:56:40.615815 arp who-has 4.42.102.5 tell 4.42.102.6
> > 20:56:40.615890 arp reply 4.42.102.5 is-at 0:e0:98:9e:84:96
> > 20:56:40.622048 4.42.102.6.1040 > 4.42.102.5.tftp: 20 RRQ "vmlinux.rec" 
>(DF)
> > 20:56:40.622112 4.42.102.5 > 4.42.102.6: icmp: 4.42.102.5 udp port tftp
> > unreachable [tos 0xc0]
> > 20:56:41.699926 4.42.102.6.1040 > 4.42.102.5.tftp: 20 RRQ "vmlinux.rec" 
>(DF)
> > 20:56:41.700006 4.42.102.5 > 4.42.102.6: icmp: 4.42.102.5 udp port tftp
> > unreachable [tos 0xc0]
> >
> > Please tell me why the PC host running tftp server is replying udp port 
>tftp
> > unreachable?
> >
> > Could this be firewall issue? The RH linux 9 installation is new & its 
>at
> > home.
> >
> > Both hosts.allow and hosts.deny files under /etc
> > are empty.
> >
> > Please tell me what other issue this might be or a procedure to debug 
>this
> > further.
> >
> > Thanks,
> > -Mike.
> >
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