Reason for 2 LAN ports?
The only reasons I have ever used them was
1) bonding, to get more bandwidth for one server than was normally
available.
back up servers need lots of incoming bandwidth and multiple NICs are a
good way
to do that. multiple bonded NICs is one way, another is nics on
separate lans
(not normal, but if two separate lans want to back up to the same
server) or
two NICs to the same lan with different IP's. I typically put a few
important
servers using one NIC, and the hordes of M$Windwers desktop machines
to
backup over the other.
2) set up servers for clients when there was an 'outward facing' NIC for
'public' traffic,
and the second was used 'in house' for out of band monitoring, backups,
internal
traffic from the NOC.
3) 'special firewall' to keep 'lab' traffic from the 'outside unwashed'.
4) to use for 'traffic shaping'. An old friend did this and had 3 NICs on
a box. One for
'normal traffic' (box maintenance, viewing reports, etc ... typical
traffic) and the other
two were for 'in' and 'out' traffic and had no IP's. They even had the
same MAC addresses.
They were used for a 'transparent firewall'. Bad traffic was just
'dropped', good traffic
was passed without interruption. Basically the customer put it between the
'bad outside world'
and their 'well behaved internal network'. ... it was an innovation at the
time, but that was 10+
years ago at a small public datacenter.
I am sure there are other reasons, but this is all I have used.
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