Slow LAN network file copy performance when copied between subnets
Posted on 2014-04-29
I am having an issue as I try to migrate my basically flat network to a more robust subnetted network. As a very basic design I have the following:
pc1(on new network)<-->access switch<-->distribution switch(layer 3)<-->firewall<-->router<-->layer 2 unmanaged switch<-->pc2(on old flat network)
Everything is Gigabit ethernet. When I try to copy a file from pc1 to pc2, it is relatively fast at about 4MB/sec. When I try to copy the same file back from pc2 to pc1, it is atrociously slow at about 100KB/sec. I am able to test everything in a duplicate test environment and cannot duplicate the issue. I suspect that it is the router because the router that is the only thing I don't have access to (because it is managed by our ISP) in the production environment and can verify in the production environment everything on either side of it works just fine.
I have also tried hard-coding speed and duplex at each location to no avail. Setting 100 M half actually didn't work on the "new" end of things so I didn't continue to the old.
Any help is greatly appreciated. Thanks in advance!