I use an older 3 nic snapgear router (SG570) to front end my cable modem and 
DSL service for VOIP. 

Snapgear routers are linux based and do a pretty good job at failover and load 
balancing.  They are also based on uclibc and 
operate much like astlinux in many aspects (and have more or less the same 
design goals) -- a linux core with a simple GUI for admin. 

On the snapgear, you can set up "policy" routes to select which WAN connection 
gets used first as the default route, and if the primary fails, the router
just sends traffic over the secondary. 

But, they have been EOLd by their last corporate owner (Mcafee)  so no more new 
units. They seem to come up on ebay regularly and 
are "bid after" as desirable pretty often. 

Another nice feature is their ability to construct IPSEC tunnels between units 
that are both on dynamic IP connections. This makes life easy 
for remote admin of just about everything. 

BTW they also support QOS reasonably well...

I think I must have 15 or so of these out in the field.. I'd go for a SG570, 
SG575 or SG560 and load the 3.2.2 firmware release.



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