[Asterisk-Users] IAX2 Softphone Quality & Network Cards

[Steve Edwards]

> For an asterisk server _always_ statically define the duplex setting
> on both the switch and the nic card. On sip phones and workstations,

Can you give an example of how to check the duplex setting and statically 
define it for, say, RedHat9

On Mon, 29 Aug 2005, Rich Adamson wrote:

>
>> Everything is set to autoneg, NICs, switches and router
>>
>
> To ensure reasonable performance, key devices (eg, routers, servers)
> should _always_ have duplex settings statically defined. Speed is
> less of an issue as the 10/100 negotiation is hard to get wrong.
>
> Part of the duplex negotiation problem is that consistent standards
> have not been implemented by all manufacturers (and nic card drivers).
> The two ends of a cat5 cable will often times try to auto negotiate
> the duplex settings at roughly the same time, and 50% of the time it
> will be wrong (eg, mismatched). As someone mentioned previously,
> mismiatched duplex settings will seriously impact performance and
> throughput.
>
> Keep in mind that opening the cat5 cable at either end (eg, unplug
> and replug the rj45) will cause a re-nogitation, as will a reboot,
> etc.
>
> There are a lot of systems and drivers that don't include the code
> to tell you what the actual duplex setting is after a re-negotiation.
> MS-based products are poor, and finding the actual setting in many of
> the linux distro's is not necessarily easy.
>
> For an asterisk server _always_ statically define the duplex setting
> on both the switch and the nic card. On sip phones and workstations,
> the duplex setting is less important, but should still match at both
> ends of the cable.
>
> (FWIW, my company does professional network performance assessments
> and you couldn't even guess how many large & small corporate admins
> don't have a clue. That's based on 12 years of experience at sites
> in over 40 US states.)
>
>
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Thanks in advance,
------------------------------------------------------------------------
Steve Edwards      sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline           pagesteve at sedwards.com            Fax: +1-760-731-3000