[GTALUG] Rogers and MTU size
james.knott at rogers.com
Sun Jan 4 19:20:55 UTC 2015
On 01/04/2015 01:51 PM, Scott Allen wrote:
> On 4 January 2015 at 12:55, James Knott <james.knott at rogers.com> wrote:
>> You can
>> verify the MTU with a ping -s 1500 <destination>. If that works, then
>> you have a 1500 byte MTU along the entire path to the destination.
> My router says that the address of the gateway that it's connected to
> is 126.96.36.199. If I ping this address I get:
> $ ping -s 1500 188.8.131.52
> PING 184.108.40.206 (220.127.116.11) 1500(1528) bytes of data.
> 1508 bytes from 18.104.22.168: icmp_seq=1 ttl=254 time=12.2 ms
> 1508 bytes from 22.214.171.124: icmp_seq=2 ttl=254 time=13.5 ms
> 1508 bytes from 126.96.36.199: icmp_seq=3 ttl=254 time=15.7 ms
> 1508 bytes from 188.8.131.52: icmp_seq=4 ttl=254 time=12.1 ms
> --- 184.108.40.206 ping statistics ---
> 4 packets transmitted, 4 received, 0% packet loss, time 3004ms
> rtt min/avg/max/mdev = 12.151/13.429/15.765/1.449 ms
That shows you have a 1500 byte MTU, so Teksavvy is doing things
properly. Either they're saying to use 1500 or not using option 26 at
all. Fire up Wireshark to see.
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