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Stephen Rowles wrote:
>
> hi,
>
> After trying to use Direct Routing on an ATM network I discovered that
> because of the ATM it is not possible to have duplicate MAC addresses for a
> single IP. The cluster will be a telnet / compute cluster which will load
> balance telnet, ftp, and SSH traffic.
>
> To solve the problem I am proposing the following setup:
<snip>
> I am planning to use NAT LVS with the real servers sending all data back
> via the director to ensure only one MAC address for the cluster VIP.
so you can access the real-servers 2 ways.
1. via the VS-NAT LVS, by the VIP
2. directly as independant machines, via their own IP
both will work and I see no reason why they can't happen at the same
time. If you are going to have telnet session open for a long time
with an LVS, the director will timeout the tcpip connection after some amount
of inactivity. The timeout can be changed in /proc. Look for a
message from Julian in the archives about timeout and tcpip.
The scaling problem with VS-NAT occurs when there are a lot of packets. If the
real-servers are compute nodes, then there will be proportionately
fewer packets being transferred between the client and the director
and you will be just fine.
Joe
--
Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
contractor to the National Environmental Supercomputer Center,
mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA
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