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Forum Discussion
tbomb80
Jan 04, 2018Guide
Modem to router speed slower than Modem to PC speed - RP614v2
Hello all! So Xfinity recently upgraded my bwidth fro 75 - 100Mbps :) I tried testing this 2 ways. I found the speed to exceed 100 Mbps via speedtest, when my pc was connected directly to my cable m...
xtroublex
Jan 05, 2018Tutor
So, since no one has responded yet, I will share what I've done so far. I had a small 4 port unmanaged switch in the network so when I eliminated that, the speed jumped up! The problem with home networking tech is that you never know for sure when the problem is a worn out or defective piece of equipment. Unless it's just dead, it's difficult to think of it being "broken".
I'm still not at the 300Mbs that I should be, so I think I will need to simply replace my router, unless anyone has anything I can try.
xtroublex
Jan 05, 2018Tutor
OH, I almost forgot, I also adjusted the MTU speed. I read the article below. Hope this helps you a bit.
- In Windows, go to Start and select Run.
- Type in cmd (Windows 2000/XP) or command (Windows 98/ME) into the Open: field. Hit the enter key or click OK. The DOS prompt should open.
- At the DOS prompt, type in ping www.yahoo.com -f -l 1492 and hit the Enter key:

- The results above indicate that the packet needs to be fragmented. Repeat this test, lowering the size the packet in increments of +/-10 (e.g. 1472, 1462, 1440, 1400) until you have a packet size that does not fragment:

- Begin increasing the packet size from this number in small increments until you find the largest size that does not fragment. Add 28 to that number (IP/ICMP headers) to get the optimal MTU setting. For example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal MTU setting.
- Change the MTU on the routers WAN Setup.
The result was a small increase (30Mbs)