I am upgrading my internet service and (temporarily) have Internet
connectivity from two ISPs. Each ISP interfaces to my LAN via its own
firewall router - with filtering - with NAT enabled - and some holes
poked through for my exposed services. It may be obvious in retrospect
(but it wasn't to me) that the external services only work when their
host points to that ISPs router as default gateway. 

That is: I can telnet to ISP-2s external IP address and get a telnet
session to my inside host only if the inside host running telnetd points
to ISP-2s router as default. But then I cannnot make any use of ISP-1
from that host. 

Is there a service or configuration I could employ to make the routing
work with two NAT gateways?? If this was addressed before - please just
point me there.

Thanks, 
Dave
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