dccproc eating up 98% of the CPU

Ruben Safir Secretary NYLXS ruben@mrbrklyn.com
Sat Oct 2 02:40:45 UTC 2004


> 
> It is extremely likely that something in or near your system
> is filtering the DCC/UDP/IP traffic like a firewall.
> There are at least 30,000 sites using the public DCC servers.
> 

I don't know how I can say this or demonstrate this more convincingly
but there is no firewall

This is the NYLXS network on a Covad DSL line.  The server has no
firewall.  It has a few dev null routes, and does masquarading for
internal machines, but there is no firewall on any ports.

Covad is not blocking udp 6277 either.   I just ran nmap and found
an open port UDP 6277 on one of the remote servers.

I also ran ttcp and aquired this result

www2:~ # ttcp -u  216.244.192.216 -p 6277
ttcp-r: buflen=8192, nbuf=2048, align=16384/+0, port=5001  udp
ttcp-r: socket
ttcp-r: 0 bytes in 49.93 real seconds = 0.00 KB/sec +++
ttcp-r: 1 I/O calls, msec/call = 51128.26, calls/sec = 0.02
ttcp-r: 0.0user 0.0sys 0:49real 0% 0i+0d 0maxrss 0+0pf 0+0csw
www2:~ # ttcp -u  216.244.192.216 -p 6277
ttcp-r: buflen=8192, nbuf=2048, align=16384/+0, port=5001  udp
ttcp-r: socket

The server is routing VoIP, httpd, httpsd, VPN/FreeSwan, Named, Mail, SSH
and occasionally VNC

I'll call Covad tech support and ask them what they think, but I
have almost 100% certainty that they are not running any blocking
on my line.


> Previous version of the DCC clients have had rare infinite loops, but
> none are known today.  I assume you have used `cdcc -V` and 
> `dccproc -V` to ensure that you are running the version 1.2.54 that
> you said you are running.
> 

Now that might be something

www2:~ # cdcc -V
1.2.36

Let  me see what is happening.

Thank you for the help

Ruben
> 
> > I do get this result at leaste from one if the IP addresses listed in the 
> > cdcc info command
i
> >
> > www2:~ # ping 208.201.249.22
> > PING 208.201.249.22 (208.201.249.22) from 64.105.122.138 : 56(84) bytes of data.
> > >From 209.204.191.30: icmp_seq=1 Destination Host Unreachable
> 
> I do not see 208.201.249.22 in 
> http://www.rhyolite.com/pipermail/dcc/2004/002407.html
> Perhaps you meant 208.201.249.232 or 208.201.249.233
> 
> > Traceroute does this
> > traceroute to 208.201.249.22 (208.201.249.22), 30 hops max, 40 byte packets
> 
> >  12  * eth2.dist1-1.sr.sonic.net (209.204.191.30)  1101 ms !H *
> >
> > I'd try it on port 6277 if it would go through
> 
> The usual problems are with the UDP responses from the DCC server's
> UDP port 6277 to your emphemeral UDP port.
> 
> There is something odd near 64.105.122.138 judging from traceroute
> from out here:
>     traceroute to 64.105.122.138 (64.105.122.138), 64 hops max, 44 byte packets
> 
>     10  nycmnyzlce1-covad-gige.wcg.net (64.200.60.142)  77.989 ms
>     11  *
>     12  *
>     13  www2.mrbrklyn.com (64.105.122.138)  95.704 ms
> 
> 
> 
> ] From: Ruben Safir Secretary NYLXS 
> 
> ] > Those consistent "not answering" results imply that you have some
> ] > kind of firewall that is blocking UDP port 6277.
> ] > See http://www.dcc-servers.net/dcc/firewall.html
> ]
> ] Oct  1 01:07:04 www2 named[12577]: lame server resolving 'ns.dcc-servers.net' (in 'dcc-servers.NET'?): 137.118.1.28#53
> 
> It works for me:
> 
>     % nslookup ns.dcc-servers.net. 137.118.1.28
>     Server:  ns1.neonova.net
>     Address:  137.118.1.28
> 
>     Non-authoritative answer:
>     Name:    ns.dcc-servers.net
>     Address:  204.152.184.184
> 
> 
> Vernon Schryver    vjs@rhyolite.com
> _______________________________________________
> DCC mailing list      DCC@rhyolite.com
> http://www.rhyolite.com/mailman/listinfo/dcc

-- 
__________________________
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