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troubleshooting Question

dual ISP (failover and load balance)

Avatar of mikeleebrla
mikeleebrlaFlag for United States of America asked on
NetworkingHardware FirewallsNetworking Protocols
13 Comments1 Solution1678 ViewsLast Modified:
here is the situation.   I currently have one internet T-1 coming into a cisco 2621 router (aka my internet router) on the serial port.  I have a new internet circuit (2MB) from another provider (they give me an ethernet handoff) that i would like to add to this router and load balance the traffic.  All of my public stuff (email, VPNs etc) are tied to the IPs on the T-1.  A network map is below:

T-1 internet-----|
                       2621---DMZ switch-------Pix 525-------3560Switch-----3825Router (internal router)-------PTP circuits to various internal sites
2MB internet----|                                                              |
                                                                                 LAN at site1

so here are my questions:

1.  can a 2621 load balance between dissimilar ports (serial and FE)? And if so how?
2.  what will i need to change on the PIX's config since currently the 'global'  IP address is my publically exposed IP on the T-1.  Where do the IPs for the 2MB internet connection come into play on the PIX?
3.  where do the new public IPs come into play on the 2621 router. Can i have dual gateways set?
4.  we host our own email server, so if i end up load balancing all outboud traffic out of the 2 ISPs will that mess up my email since sometimes the reverse DNS IP will not match?

Thanks in advance,

Avatar of Les Moore
Les MooreFlag of United States of America imageSystems Architect
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