Hi All,
I am looking for advice on a LAN performance issue. i
am running primarily NT4 and win2K boxes on a 100Mbit
UTP Ethernet LAN.
my servers are on static IPs on one subnet while my
clients pick up DHCP addresses (assigned out of my
control) in any one of half a dozen other subnets.
file transfer and printing performance between client
and server is averaging 1Mbit/sec when computers are
in different subnets. switch the same two computers to
static IPs in the same subnet and throughput jumps to
a respectable 30-70Mbit/sec. i need to keep the
clients on DHCP as i don't have enough static IPs to
go around for the subnet the servers are in.
all clients and servers are attached to one of 5
Allied Telesyn 8126XL 24-port managed switches. all 5
of these "edge" switches connect to another switch of
the same model with a 100Mbit multi-mode (1300
nanometer) fiber uplink which connects to a Cisco
Catalyst 5500 for our routing needs.
When the clients are on different subnets the file
transfers appear to take a long trip through the
router with a huge performance penalty (1Mbit/sec).
when the client and server are on the same subnet the
packets do NOT appear to be routed (perhaps they are
handled using ARP?) and the performance is very good.
ping response times on both switches and routers is
under 20ms. This is where I believe supernetting could
be a solution to this slowness, because I think
supernetting allows me to put all stations in the same
subnet, witch avoids routing needs.
I got some responses to my previous post from people
saying that supernetting would slow down the speed
because there would be too many stations in big
broadcast domain, which contradicts what I am willing
to do.
Am i missing some key concepts here that might improve
my understanding of this tragic performance?
any help would be greatly appreciated.
take care,
jw
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