The Netgear WNDR3400 I tried to use to multihome CenturyLink and #CalyxInstitute turned out to be really, really bad for the purpose. It worked, but threw out half of the bandwidth of both connections, probably by being underpowered.
Plan C is to use a spare laptop as ISP clients, multi-wan load balancer and simple router. Any suggestions for a purpose-built #linux distro to make this less painful?