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RT-N66U w/ Shibby 1.32 cutting Internet speed in half

B

BigWazoo

Junior Member
Hey all,

Cox recently upped my Internet speed to 300mbps.

When I connect directly from a PC to the cable modem, I get the full 300 (and then some).

However, once I put my router right behind the modem, all my speed tests get knocked in half to 150mbps.

I tried removing everything else from the router and shutting off wifi and then ONLY connecting my PC to the router to eliminate all other variables and the problem remains.

This is an ASUS RT-N66U running the latest Shibby firmware.

Any ideas why this is happening?

Thanks in advance!
 
I don't know what services you have running but traffic through the router is always slower. BTW I didn't have good luck with 132. My network would slow to a crawl. I had to go back to 131.
 
Bird222 said:
I don't know what services you have running but traffic through the router is always slower. BTW I didn't have good luck with 132. My network would slow to a crawl. I had to go back to 131.
Click to expand...

I have zero services running on the router (except for updating my Dyn DNS info).

I was running 128 with the same results and updated to 132 hoping that would help.

Still, even assuming some drop off when going through a router, doesn't a 50-60% drop in throughput strike you as wrong?

I should also point out that moving data on the Intranet is not a problem. I can move multi-gig movie files to my NAS and get around 700mbps sustained.
 
Make sure you've cleared the NVRAM after flashing a new firmware. This will reset ALL options, so make notes beforehand.
 
Original ASUS firmware ought to have no trouble with 300mbps. Smallnetbuilder tests the WAN-LAN speed at 732mbps. I also assume that when you mentioned WiFi was off that your tests were all Ethernet. If so, I'd reduce your router ALL the down to being an Ethernet switch and see if you get the same speed. If so, go back to the ASUS firmware and test that.

By the way, if your test speed is closer to 120mpbs, it could also be your cables. Your cable may work fine directly connected to your cable modem, but when connected to your ASUS router, it may degrade the speed back to 100mpbs. An opposite occurance happened to me before where my cable was fine at gigabit to the router, but plugged into the cable modem (which was gigabit capable) it reduced itself to 100mpbs. Connecting a different shorter cable works as expected. Giga all around.

Best of luck.
 
Shibby's firmware may do a speed test when it was installed and caped your performance due to QoS if you have it enabled, try checking for any up/dl caps in the firmware or go back to the stock asus / merlin firmware that doesn't have this feature.
 
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