Forum discussion: I note most ppl state MTU of 1488 is best, but I note throughput drops when I set everything to 1488, and goes back to the better throughput when I reset back to 1500. Is

Determine the Correct MTU for Your Network: Launch the command prompt. From your desktop, … Understanding Data Throughput in a DOCSIS World - Cisco Aug 25, 2008 Ping Test to determine Optimal MTU Size on Router | Answer

In computer networking, the maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be communicated in a single network layer transaction. The MTU relates to, but is not identical to the maximum frame size that can be transported on the data link layer, e.g. Ethernet frame.. Larger MTU is associated with reduced overhead.

Re: Modem to router speed slower than Modem to PC speed - RP614v2 Thanks for the advice on the MTU. I did the same process you did and then checked my MTU in WAN and it was already set correctly(to 1500). MTU means Maximum Transmission Unit. It specifies the largest packet size permitted for Internet transmission. If your MTU is too large for the connection, your computer will experience packet loss or intermittent connection. NOTE: The Maximum Transmission Unit (MTU) of Linksys routers is 1500. Since dial up uses a default MTU of 576 bytes you will not have the same problems as broadband. If you have problems with both broadband and dial up access then the problem is probably something else. Summary One of the easy and most accurate ways to test for optimum MTU is to do a simple DO S P ing test. You will simply send out ping requests and progressively lower your packet size until the packet no longer needs to be fragmented. If you are using a Cable Modem WAN connection: 1500. If you are using a DSL WAN connection: 1492. Sample layout of the command: $> ping –f –l (this is a lowercase “L”) [MTU size] [destination] How to check your LAN connection of your router to your computer: $> ping –f –l 1500 How to check your WAN connection from your

Traceroute allows you to map the network path from the cable modem to a public host. MTU (Maximum Transfer Unit) specifies maximum transmission unit size. Set the Connect Box MTU, in bytes. The minimum is 68 bytes. The default is 1500 bytes. Page 28: Admin