[Asterisk-Users] IAX2 Softphone Quality & Network Cards

[Rich Adamson]

> > 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

Multiple ways... try 'dmesg | grep duplex' or use 'mii-tool'.

Be careful with assumptions relative to what happens after a reboot
on any system. Static use of the mii-tool within your system startup
scripts may be necessary to ensure full duplex operation.


> 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
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