Jonathan987
join:2006-03-17
North York, ON
| Question about MTU
Hey TSI gang, just got a short question about the MTU....has everyone changed from 1452 to 1492 now? I remember reading a post from R0CKY about everyone being switched over by the end of April... 
Thanks,
Jonathan |
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R0CKY
TSI Rocky
Premium,VIP
join:2005-05-19
Chatham, ON | Not yet.... April would have been nice but between some complications with the next Gig-E and hardware delays, it will likely be mid to late June.
Rocky
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TSI Rocky - TekSavvy Solutions Inc. |
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Jonathan987
join:2006-03-17
North York, ON | no worries, how do I check if I should be on 1452 or 1492?
thanks,
Jonathan |
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GDSComp
join:2004-08-30
London, ON | Download Dr. TCP or TCP Optimizer from Speedguide. It'll do it for you when you run the Largest MTU. Hope this helps. |
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TSI Steve
TSI Steve
Premium,VIP
join:2007-01-12
Chatham, ON
| reply to Jonathan987
said by Jonathan987  :Hey TSI gang, just got a short question about the MTU....has everyone changed from 1452 to 1492 now? I remember reading a post from R0CKY about everyone being switched over by the end of April... Thanks, Jonathan Hello,
We have a two part answer.
Right now we are in transition from one type of service (Direct connections to the TSW's) from Bell to another service (AGAS) and as we switch over the tunnels we change the MTU..
If you are running on the old service, we are pushing 1452.
If you are running on the new service, we are pushing 1492.
The Montreal and Toronto areas have both been upgraded at this point. Along with a few smaller areas.
If you are using Windows, you can create a dialer and enable debugging for RAS to see what we are pushing out to you!
Steve
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TSI Steve - TekSavvy Solutions Inc. |
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GDSComp
join:2004-08-30
London, ON
|  well Ok.. how about this ?
Pinging [66.230.207.58] with 40 bytes ->bytes=40 time=101ms TTL=49
Pinging [66.230.207.58] with 750 bytes ->bytes=750 time=112ms TTL=49
Pinging [66.230.207.58] with 1125 bytes ->bytes=1125 time=117ms TTL=49
Pinging [66.230.207.58] with 1312 bytes ->bytes=1312 time=121ms TTL=49
Pinging [66.230.207.58] with 1406 bytes ->bytes=1406 time=122ms TTL=49
Pinging [66.230.207.58] with 1453 bytes -> ..fragmented
Pinging [66.230.207.58] with 1430 bytes ->bytes=1430 time=123ms TTL=49
Pinging [66.230.207.58] with 1441 bytes ->bytes=1441 time=123ms TTL=49
Pinging [66.230.207.58] with 1447 bytes ->bytes=1447 time=123ms TTL=49
Pinging [66.230.207.58] with 1450 bytes ->bytes=1450 time=122ms TTL=49
Pinging [66.230.207.58] with 1451 bytes ->bytes=1451 time=123ms TTL=49
Pinging [66.230.207.58] with 1452 bytes ->bytes=1452 time=122ms TTL=49
The largest possible non-fragmented packet is 1452 (1480 - 28 ICMP & IP headers).
You can set your MTU to 1480
what shall I set it at ?  |
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TSI Steve
TSI Steve
Premium,VIP
join:2007-01-12
Chatham, ON
| said by GDSComp : well Ok.. how about this ? Pinging [66.230.207.58] with 40 bytes ->bytes=40 time=101ms TTL=49 Pinging [66.230.207.58] with 750 bytes ->bytes=750 time=112ms TTL=49 Pinging [66.230.207.58] with 1125 bytes ->bytes=1125 time=117ms TTL=49 Pinging [66.230.207.58] with 1312 bytes ->bytes=1312 time=121ms TTL=49 Pinging [66.230.207.58] with 1406 bytes ->bytes=1406 time=122ms TTL=49 Pinging [66.230.207.58] with 1453 bytes -> ..fragmented Pinging [66.230.207.58] with 1430 bytes ->bytes=1430 time=123ms TTL=49 Pinging [66.230.207.58] with 1441 bytes ->bytes=1441 time=123ms TTL=49 Pinging [66.230.207.58] with 1447 bytes ->bytes=1447 time=123ms TTL=49 Pinging [66.230.207.58] with 1450 bytes ->bytes=1450 time=122ms TTL=49 Pinging [66.230.207.58] with 1451 bytes ->bytes=1451 time=123ms TTL=49 Pinging [66.230.207.58] with 1452 bytes ->bytes=1452 time=122ms TTL=49 The largest possible non-fragmented packet is 1452 (1480 - 28 ICMP & IP headers). You can set your MTU to 1480 what shall I set it at ? FYI : We set our global MTU to 1452 because of clients that use VPN, the VPN packets need more header space...
I recommend you set it to 1452 for link efficiency.
TSI Steve |
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GDSComp
join:2004-08-30
London, ON | reply to Jonathan987
Thankyou |
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TSI Gabe
Premium,VIP
join:2007-01-03
Chatham, ON
| I was actually playing around with that yesterday and Marc pointed our to me that Windows XP defaults to an MTU 1480. It's a little painful to change this as you have to play in the registry. If you are on our new system (called AGAS) which you appear to be, you should be able to push 1492. |
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hdefjunkie
join:2005-01-14
Kanata, ON | How does one tell whether they are on the new or old system? |
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