[Asterisk-Users] IAX2 Softphone Quality & Network Cards

[Huddleston, Robert]

If nic is loaded using modprobe - you can set options for duplex -
depending on the nic...
See /etc/modules.conf
 
 

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> Rich Adamson
> Sent: Monday, August 29, 2005 11:13 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: RE: [Asterisk-Users] IAX2 Softphone Quality & Network Cards
> 
> 
> > > 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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> ---------------End of Original Message-----------------
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