09-30-2014 05:47 PM
Hi,
I've enabled 9000 MTU everywhere I could on this switch, but I can't ping greater than 1500. I imagine that this could be due to a DoS prevention, but there's no setting to turn that off! What am I missing?
Running version 1.0.8.3
Thanks
10-01-2014 05:57 AM
Hi Askhaan,
Please check your PC NIC advanced settings as well as OS settings. for windows that would be:
netsh interface ipv4 show subinterfaces
Regards,
Aleksandra
10-08-2014 09:01 AM
I can confirm this is an issue as well. When I remove the SG200-08P from the mix I can ping with >1514 MTU sizes. Put it back in and nothing. Ports are set to 9216 MTU on the switch.
10-08-2014 09:06 AM
Also, under RMON, the oversize packets counter increases with my sent ICMP packets.
10-08-2014 09:16 AM
This seems to be limited to ICMP packets. I did verify I could push jumbo frame through via watching streams on wireshark.
Here's a thread saying the ICMP limit is "as designed".
https://supportforums.cisco.com/discussion/11262811/sg-200-08-jumbo-frames-not-forwarded
10-08-2014 10:14 AM
Is there no way to correct this design flaw?
10-08-2014 10:17 AM
From my understanding, this only affects ICMP packets. It has been a "feature" since the unit was initially released years ago. Some kind of DOS protection.
10-08-2014 10:24 AM
I get that, but how do we turn it off?
The SG300 works perfectly.
10-08-2014 10:29 AM
By "feature" I mean it can be considered a bug to some people. There is no way to turn it off.
You are able to pass frames larger than 1518 bytes as long as they aren't ICMP packets. My SG200-28P works as expected with ICMP like the SG300. Seems this 8 port version is really a different breed from the other 200 series. Like an adopted cousin.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide