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Visitor
Posts: 2
Registered: ‎11-11-2008
Accepted Solution

mtu setting

Could anyone please tell me what modem mtu setting is, for docsis 3.0? And Router, 1500 or 1492 or must i do ping tests to find out so i can match computers to same and stop fragmentation or reduce it? Asked CSR tech. they didn't know what mtu was.

Connection Expert
EG
Posts: 40,094
Registered: ‎12-24-2003

Re: mtu setting

The correct MTU parameter for the Comcast network is 1500.

Regular Contributor
Posts: 74
Registered: ‎09-27-2008

Re: mtu setting

 


EG wrote:

The correct MTU parameter for the Comcast network is 1500.


Using the method on this web page, I find the largest packet I can send is 1472 bytes.

 

 

Should I not set my router's MTU to 1472?

Regular Contributor
Posts: 74
Registered: ‎09-27-2008

Re: mtu setting

Never mind, I forgot about ping's 28 header bytes. So 1500 looks exactly correct.

Connection Expert
EG
Posts: 40,094
Registered: ‎12-24-2003