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Switch slow LAN when connected to WAN

DragonSpawn

New Around Here
I have noticed that when I hook up my switch straight to the WAN (I have a TP port straight in the wall here with 100/10mbit so I don't actually need a router). And I notice that at random intervals suddenly LAN - LAN speed drops insanely for random computers in my network. We are talking about 300KB/sec transfers where the other day there was 80MB/sec. However WAN speed is never affected by this. I always get a solid 90/8 when doing online benchmarking.

Before I lived in a dorm with a similar setup (tp into the wall) and had some really old and extremely cheap C-Net switch, which gave me the same issues. Could work fine for weeks, then all of a sudden you get crap speeds and it doesn't help to turn the computer or switch off or anything like that. The only remedy was most often resolved after the computer was turned off for the night (did not always solve the issue though).
This persisted when I moved to my current place so I bought a new switch (Neatgear gs108t) which was of much better quality. However this switch also has the same issue and I can't for the life of me understand why a switch would have so many issues with my configuration.

I should also mention that I do not have static IP's (DHCP) so I get new ones every 24h or so, and I personally suspect it would have something to do with this. If I connect the switch to a router, or disconnect it from the internet and assign static IPs to my computer, the problem vanishes. Plug it back into WAN: problem is back instantly.

Doing a factory reset on the switch does nothing. I have spoken with Netgear's customer support for a while now but they are just doing the usual run-around and stalling until I give up and stop pestering them about it.

So I would highly appreciate it if someone has any idea of why this is happening to switches, if there is some solution to it and/or if you have experienced this yourselves.
 

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