03-03-2015 05:17 AM - edited 03-14-2019 02:30 PM
Hi,
Can someone tell me what MTU values I can enter for the EPC3925. The default value =0 (1500 bytes).
The manual does not show a listing of values and the associated nbr. of bytes.
Thanks.
Wesjo
03-03-2015 10:08 AM
Hello,
Thank you for your question. However, this community is for Cisco Small Business Products and the EPC3925 is not a Cisco Small Business Product.
Your product is an internet service provider (ISP) supported product. In other words you need to contact your ISP or technology reseller that you purchased this from to help you with your question.
http://www.cisco.com/web/consumer/support/modem_EPC3925.html
http://www.cisco.com/web/consumer/support/prod_modems.html
Regards,
Glenn Martin
03-04-2015 01:11 AM
Hi Glenn,
First thing I did was contacting my ISP.
They had absolutely no clue, other than suggesting I should not change any setting of the router, and referred me to Cisco. Hence my question in this forum.
Rgds,
Wesjo
06-24-2015 07:45 PM
This discussion has been reposted to the CSC Content with No Valid Community to Post community
03-03-2015 10:21 AM
Hello Wesjo,
The way to determine if you are using the correct MTU is to follow the steps below.
-open a command prompt (Windows+R, cmd, Enter)
-type 'ping 8.8.8.8 -f -l 1472'
--You will receive one of two possible results;
---Reply from 8.8.8.8 bytes 1472...
or
---Packet needs to be fragmented but DF set
If you get the first one then your MTU is good at 1500 .
If you get the second one then try lowering the value until you get a reply. Then you will take the value that worked and add 28, that is your correct MTU.
OR you could use a tool like the one available at http://www.speedguide.net/downloads.php.
Hope this resolves your issue. Also, the EPC3925 is not technically a Cisco small business device. The phone number for support on that unit is 855-858-1882.
Regards,
Mike.V
03-04-2015 01:07 AM
Hi Mike,
Thanks for the reply. I know how to find the optimum MTU.
The manual of this router shows that the default MTU value 0 =1500 bytes. So I assumed that there must be a table that shows value 1 = x bytes, value 2 = y bytes etc. etc. I just read thatit is not the case and that just value 0=1500 bytes. Any other value you choose is the absolute MTU required (e.g. value 1200 = 1200 bytes)
Rgds,
Wesjo
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