Community Forum

mtu setting

Regular Visitor

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.

Expert

Re: mtu setting

The correct MTU parameter for the Comcast network is 1500.



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
Contributor

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?

Contributor

Re: mtu setting

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

Expert