[CentOS] 8139 dropping packets

Mon Oct 29 14:57:48 UTC 2012
Giles Coochey <giles at coochey.net>

On 29/10/2012 13:26, Jerry Geis wrote:
>> ck your duplex.  I have had two recent problems with duplex:
>> One, with a Cisco router - it auto-negotiated every time to half duplex, even
>> though it really -was- full.  Use mii-tool to find out.
Just a note, auto-negotiation of 10/100 links will not work reliably 
unless both sides of the link are set to auto-negotiate.

If one side is set to 100/full, and the other side is set to auto 
negotiate, then it will try to negotiate, the side that is hard coded 
100/full will _NOT_ negotiate and negotiation will fail, the side that 
was set to auto negotiate will fail back to a 'fail-safe' 10/half duplex 

My rule of thumb, static link (e.g. those to servers, inter switch 
links, switch to router links etc...) should just be hard coded. Links 
that might have a variety of devices connected to them, e.g. the access 
layer ports - set them to auto-negotiate.


Giles Coochey, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
giles at coochey.net