Syslinux - Oct 2004 - in.tftpd not responding when listening on 255.255.255.255

I've got in.tftpd configured on a Fedora Linux server. The service is
configured to boot printersm and sun sparcs. The printers boot fine, but
there's a problem with the sparcs.

When the sparc sends an initial request for a file, in.tftpd forks a
process to handle it. If  I do a "netstat -pan | grep tftp" I see that
this forked process is listening on local address 255.255.255.255:<high
port number> and is connected to the sun sparc.

However, the sparc fails to download the file, just hangs waiting. A
tcpdump on the server shows that the server responds to the sparc with:

"server udp port <high number port> unreachable"

I'm assuming its unreachable because the in.tftpd process is listening on
the 255.255.255.255 local address instead of the server's local address.

How do I fix this or otherwise deal with it?

Thanks -


-- 
Regards,

Michael Martinez
Manager Systems Administration / Tech Computing Center
New Mexico Institute of Mining and Technology
Socorro, NM 87801

Are you sure the redhat firewall isn't getting in your way?

Run "iptables -vL" to see what your current rules are, if any.

Michael Martinez wrote:
>I've got in.tftpd configured on a Fedora Linux server. The service is
>configured to boot printersm and sun sparcs. The printers boot fine, but
>there's a problem with the sparcs.
>
>When the sparc sends an initial request for a file, in.tftpd forks a
>process to handle it. If  I do a "netstat -pan | grep tftp" I see
that
>this forked process is listening on local address 255.255.255.255:<high
>port number> and is connected to the sun sparc.
>
>However, the sparc fails to download the file, just hangs waiting. A
>tcpdump on the server shows that the server responds to the sparc with:
>
>"server udp port <high number port> unreachable"
>
>I'm assuming its unreachable because the in.tftpd process is listening
on
>the 255.255.255.255 local address instead of the server's local address.
>
>How do I fix this or otherwise deal with it?
>
>Thanks -
>
>
>  
>

Michael Martinez wrote:
> I've got in.tftpd configured on a Fedora Linux server. The service is
> configured to boot printersm and sun sparcs. The printers boot fine, but
> there's a problem with the sparcs.
> 
> When the sparc sends an initial request for a file, in.tftpd forks a
> process to handle it. If  I do a "netstat -pan | grep tftp" I see
that
> this forked process is listening on local address 255.255.255.255:<high
> port number> and is connected to the sun sparc.
> 
> However, the sparc fails to download the file, just hangs waiting. A
> tcpdump on the server shows that the server responds to the sparc with:
> 
> "server udp port <high number port> unreachable"
> 
> I'm assuming its unreachable because the in.tftpd process is listening
on
> the 255.255.255.255 local address instead of the server's local
address.
> 
> How do I fix this or otherwise deal with it?
> 
Sounds like your sparcs are trying to boot from the broadcast address.  I 
think you need to reconfigure your rarp/bootp/dhcp server, whichever they use, 
to give the IP address of the TFTP server properly.

	-hpa