Re: [Asterisk-Users] Trouble with 2 NIC cards

Tue, 28 Oct 2003 07:27:08 -0800

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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Chee Foong
Sent: Sunday, October 26, 2003 6:00 PM
To: [EMAIL PROTECTED]
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: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
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



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