On 09/07/2011 01:06, Les Mikesell wrote: > Turning off negotiation pretty much guarantees problems if anything > changes at the other end or you use an unmanaged switch. And the > gigabit spec requires auto-negotiation. Let me make it clear - auto-negotiation only works if auto-negotiation is configured on both sides. It does not work if one side hard codes the speed and duplex. Both sides have to be set for it to negotiate. Agreeing on speed and duplex ensures that it will work. If something is going to change on the remote end without you knowing, or your provider is using an unmanaged switch then it's time to change provider :-) - they obviously are cheapskates and don't have any change management control on their systems. Gigabit is different. -- Best Regards, Giles Coochey NetSecSpec Ltd NL T-Systems Mobile: +31 681 265 086 NL Mobile: +31 626 508 131 GIB Mobile: +350 5401 6693 Business Email: giles.coochey at netsecspec.co.uk Email/MSN/Live Messenger: giles at coochey.net Skype: gilescoochey -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 4320 bytes Desc: S/MIME Cryptographic Signature URL: <http://lists.centos.org/pipermail/centos/attachments/20110709/147b4fa0/attachment-0005.p7s>