hello.

is there any bandwidth load balancer running on linux???

here's my scenario.  i am running a domain, with a webserver, squid proxy,
and a sendmail mail server inside.  my domain has an IP given to me by my
ISP (lets call them ISP1).

i have an additional ISP (lets call it ISP2), independent of which my domain
is connected to (which is ISP1).  i send our outgoing emails to another
sendmail server (via DNS), which has one of its network card connected to
ISP2.  my incoming mail server is a separate sendmail server, connected to
ISP1.

i use DNS changing to what proxy server the users are connecting to) to
temporarily move over all the www browsing from ISP1 to ISP2 from time to
time, just observing bandwidth usage.


i only have one physical server each for sendmail and squid.

is there a way to configure these servers in such a way that when one of the
bandwidth has heavy traffic or is slow, the load is passed (or
load-balanced) in the other bandwidth (especially squid proxy)?

in case the ISP1 is loaded, how would the emails which entered thru ISP2
(not thru where my incoming email server is directly connected to) be sent
to the original mail server (since I only have 1?)

solving this would also address bandwidth redundancy, in case ISP1 is down,
ISP2 will handle all the load.

how can these be implemented?  what software / hardware is needed to attain
this fully load balanced, redundant setup?

_
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