On 8/20/10 6:56 AM, Tom Chadwin wrote:
> Hello all
>
> We are happily running 0.7.2 net5501s on our sites. They each have PSTN
> cards, but communication between them is via IAX2 over the external NICs
> connected to ADSL (the only internet connection available to us in our rural
> locations).

What are the PSTN cards for?  Local handsets?  Because in the scenario below 
you need at least one PCI slot for ADSL cards.  Yawarra makes a 1U enclosure 
that with a PCI riser card will take 2 PCI cards, I believe.

Be careful not to exceed your power budget, though.

> We currently have separate machines which run our VPNs (and firewalls, DHCP,
> and web proxies) on separate ADSL lines, but these machines are
> licence-encumbered (in a manner of speaking). I am interested in
> investigating using our Astlinux boxes instead. However, given that the
> connections are ADSL (0.8Mbps uplink), I cannot share VoIP and VPN over one
> line.

Traverse Technologies makes the Solos PCI card, which comes in 2 and 4 port 
versions.

You can then use multilink to bond several PPP circuits together into a single 
IP interface, which Astlinux will support.

> Is it possible to enable a second external interface in 0.7.2 - I seem to
> remember EXT2IF being mentioned in the past - using NIC1 for VoIP and NIC 2
> for everything else, especially VPN and client PC internet access?

I'm not sure anyone has ever tried this, and I suspect it won't work... that 
said, we might be able to fix it so it does work.

Not sure AIF or traffic shaping will work correctly over multiple egress 
interfaces.  You might need some iptables trickery to get the correct traffic 
to flow out over the correct interface.


> If this were possible, how would the net5501-70s be likely to perform under
> this load? Our head office VPN box currently runs 5 IPSec tunnels to other
> offices, and 15 L2TP road warrior connections, the latter with never that
> many concurrent - perhaps around 5 max, two or three normally.
>
> Thanks
>
> Tom

That depends equally on the speed of the clients at the other side... but 
assuming your DSL connection is maxed, out, it shouldn't be a problem...  the 
net5501 has plenty of cycles.

-Philip


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