Is there anything between your pc and the router that might be blocking ICMP? and/or not jumbo capable?
Assuming its not a bug, either the packets are being discarded by something that is not jumbo capable (or enabled for jumbo) and/or something has a lower MTU and its ICMP too large responses are not getting back to the router.
Also, not every jumbo is necessarily the same, for instance maybe the router can do 9000 jumbo frames, but the pc, or something in between can only do 8000, in which case you'll need to set your MTUs to the lowest common value.
In your case, I see you have matching MTUs, so is the client directly connected to the rb1100 with nothing in between (perhaps a switch)? You could try doing packet capture or torch to try to see where the problem is.
You might also want to look in device manager and see what the ethernet device itself says for MTU and jumbo, besides what windows is claiming.
Yes it connected directly into rb1100,here you can the adapter :
It claims as Gigabit Nic but i cann't found anywhere on advanced settings tab about jumbo frames,could be the large send(ipv4) settings?,it's already enabled,and the speed and duplex setting as you can see only max 100 mbps full duplex,it's seem my nic only Gigabit capable not full gigabit,i was tested the Nic to do a tx into a server in which connected to the router but different subnet,result :
$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.99.14 port 5001 connected with 192.168.77.2 port 17087
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 379 MBytes 317 Mbits/sec
but tx & rx sure do exceeding a 100mbps nic,at max i could get from 200mbps-350mbps,sample
$ iperf -c 192.168.77.2
------------------------------------------------------
Client connecting to 192.168.77.2, TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------
[ 3] local 192.168.99.14 port 14349 connected with 19
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 318 MBytes 267 Mbits/sec
the windows doesn't automatically set the nic mtu as 9000 but i was set it myself,strange thing i've get more 4-6% rx increase from the Wan interface,don't know much about networking but strange heheh.Btw my nic is builtin one from my notebook Acer 4740G i5.
