The SA500 series does support load balancing for up to two WAN connections on the Dedicated and Optional WAN ports. Make sure you configure both WAN ports with the Connectivity Type set to Keep Connection. If the WAN times out, load balancing isn't effective.
There is also the option of "protocol binding," wherein you can specify services (by default there are some services already included by default, or you can designate you own based on port number), and then "bind" those services to only travel on a specific WAN port, to further control the traffic.
Further to the OP, If I may request a bit more info regarding a problem I have.
I have configured my SA520 like this:
WAN - naked ADSL cct, just static IP address configured
Optional port - PPPOE ADSL cct with static IP
Optional port load balancing with NO failure detection selected
Protocol bindings : SMTP to dedicated WAN, HTTP & HTTPS to Optional port
My issue is this: I can check my HTTP IP using www.whatsmyip.org and it will usually sho the IP for the optional port. However occasionally it will show the IP for the dedicated wan port. This isn't a great issue for HTTP but it seems that SMTP is also being swapped over. This is an issue as I cannot receive mail at these times
I also have a bandwidth profile set to the dedicated wan port for SMTP to rate limit the outgoing SMTP traffic to low priority
My question is how and why is the traffic being swapped over and how can I stop it from happening?
If there a way to see what the current status is, eg thru SNMP messages?
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