[Asterisk-Users] Trouble with 2 NIC cards

Tue Oct 28 10:11:49 MST 2003

A lot of people put two NICs in a fire wall box for
security puroses.  THat way your local network is
physically isolated from the public Internet.  That way
no matter how dumb your users are and how badly they mis-
configure their Windows boxes you are protected.  Without
a physically isolated LAN some Windozze user could do a
share to the world.  But for home use where you have only
a very few computers such that yu can imspect each one,
using one NIC works.

As for performance if that's what you need, two NICs might
help some but Gigabit Ethernet is now affordable.  Running
1000mbps to a 1000/100/10 switch buys you 10X performance
gain vs. 2x.  I've found that in general 2x gains are
hardly noticable at the end user level.

--- "Stephen R. Besch" <sbesch at acsu.buffalo.edu> wrote:
> I don't know if this helps, but I run 2 Nics; one for access to the 
> 192.168 (private) domain, the other for the public domain.  Under RH
> the 
> second card was autodetected, installed and became available in the
> net 
> setup, where I assigned IP addresses to the cards and off I went.  No
> 
> troubles at all.  I suspect that your problems stem from one of 2 
> sources.  Either there is an interrupt conflict, which incidentally,
> is 
> not a trivial issue to resolve any more, since virtually all PCI 
> computers use shared interrupts on the PCI bus, regardless of how
> many 
> free hardware interrupts there are.  It is not uncommon to have only
> one 
> slot that you can configure for an unshared interrupt, and then you 
> frequently have to make sure that some of the MB resources are 
> disabled.  Since the Digium card needs an unshared interrupt slot,
> you 
> had better make sure that the NICs will run with shared interrupts. 
> The 
> second item is the software setup.  The  only suggestion I can make
> here 
> is to read, read, then read some more.  There is a sometimes 
> overwhelming, but tractable body of information out there regarding 
> setting up hardware under linux.
> 
> But first, ask yourself another question.  Do you really need 2 NICs.
>  
> Linux has the very nice feature of letting you assign multiple IP's
> to a 
> single NIC.  You can listen on a private IP subnet for the NAT part
> and 
> also have an IP on the public IP address space.  I know this works 
> because I did it myself before I installed the second NIC, which I
> did 
> for performance reasons (One is dedicated to the phone audio/SIP 
> streams, at the present time 20 phones, and the other routes calls to
> a 
> VOIP provider over the internet.
> 
> Stephen R. Besch
> 
> Asterisk wrote:
> 
> >The problem should be easy enough to solve for someone who knows the
> >internal guts. As a matter of fact, this is very important to
> resolve.
> >Asterisk behind firewall is trouble and that is known already. So I
> >decided to use the same linux box as firewall, meaning I need
> atleast
> >two NICs. I wonder how others are solving this issue. I refuse to
> >believe that no one faced similar problems cause there is no other
> way
> >for a beginner to plant an Asterisk box but have two NICs or go
> through
> >the NAT troubles. Moreover, there are news posts all over about SIP
> >phones meaning others are connecting more than one NICs. Wonder why
> they
> >don't have similar issue. I am sure that there are more out there
> who
> >are facing similar problems so people who have solved this, please
> speak
> >up and help us all.
> >
> >Thanks in advance.
> >Ricky
> >
> > 
> >
> >-----Original Message-----
> >From: asterisk-users-admin at lists.digium.com
> >[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Chee
> Foong
> >Sent: Sunday, October 26, 2003 6:00 PM
> >To: asterisk-users at lists.digium.com
> >Subject: Re: [Asterisk-Users] Trouble with 2 NIC cards
> >
> >Hello,
> >I have the quite similiar problem like yours except that both of my
> NIC
> >have
> >fix public ip from different ISP provider.
> >Unfortunately we are unable to make it work. This is due to some
> routing
> >issues of the Asterisk box. My collegue was trying hard to seting up
> the
> >routing tables, but did no succeed.
> >
> >We finally has given up trying. The solution we have make is to have
> 2
> >different asterisk iax server and make these server peer to each
> other,
> >but
> >not yet try though.
> >
> >
> >----- Original Message -----
> >From: <thisemailaddressisbogus at risehigh.com>
> >To: <asterisk-users at lists.digium.com>
> >Sent: Friday, October 24, 2003 7:39 AM
> >Subject: [Asterisk-Users] Trouble with 2 NIC cards
> >
> >
> >  
> >
> >>Greetings everyone.
> >>
> >>Did anyone try using 2 NIC cards on the machine? For some reason,
> >>    
> >>
> >asterisk
> >  
> >
> >>can not identify which IP should be used. In the config files
> >>    
> >>
> >(IAX.conf,
> >  
> >
> >>sip.conf etc), there is a way to bind the IP address but if the
> >>    
> >>
> >machine is
> >  
> >
> >>hooked to a DHCP server (such as cable modem), then fix IP doesn't
> >>    
> >>
> >work.
> >It
> >  
> >
> >>should be simple to bind it to a perticular ethernet card (eth0 or
> >>    
> >>
> >eth1)
> >  
> >
> >>instead of an IP address. Anyone tried multiple NICs with asterisk?
> >>Please write your commentes.
> >>
> >>Thanks.
> >>Ricky
> >>
> >>
> >>
> >>_______________________________________________
> >>Asterisk-Users mailing list
> >>Asterisk-Users at lists.digium.com
> >>http://lists.digium.com/mailman/listinfo/asterisk-users
> >>
> >>    
> >>
> >
> >_______________________________________________
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> >Asterisk-Users at lists.digium.com
> >http://lists.digium.com/mailman/listinfo/asterisk-users
> >
> >_______________________________________________
> >Asterisk-Users mailing list
> >Asterisk-Users at lists.digium.com
> >http://lists.digium.com/mailman/listinfo/asterisk-users
> >
> >
> >
> >  
> >
> 
> 
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=====
Chris Albertson
  Home:   310-376-1029  chrisalbertson90278 at yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson at aero.org
  KG6OMK

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