[Gllug] Problem with new Virgin 50Mbps Modem

[Alain Williams]

You may be interested in the solution for a customer of mine who recently
installed (upgraded to) the Virgin 50Mbps Super Hub.

The symptoms were lost packets, this badly affected incoming emails (we run an
MTA) especially, for some reason, those from google/gmail. There was (I think)
also a problem with an SSL session.

The fix is to set the MTU to 1460. We did that with an immediate improvement.

The sad thing is that we have been beating our heads on the table for a week,
with various Virgin support droids blaming our config.

On a redhat system edit /etc/sysconfig/network-scripts/ifcfg-eth0 and
insert the line:
    MTU=1460

After fixing it you will see 1460 as in below:

# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:0D:56:64:3A:C6  
          inet addr:192.168.10.2  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::20d:56ff:fe64:3ac6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1460  Metric:1
          RX packets:31171623 errors:4 dropped:13 overruns:0 frame:0
          TX packets:19810324 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4150314049 (3.8 GiB)  TX bytes:3814195185 (3.5 GiB)
          Interrupt:201 


-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
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