Why is MTU 1362 on bfsr41?!?

[scottyL]

i used drtcp to set my mtu at 1492, but every time i go to dslreports.com and try the tweak tester it says my mtu is 1362!!! it is slowing me down about 15-20 kbps. any help would be greatly appreciated!!
thank you!!

[dedub]

first I would go to the registry myself and see what it accully is. do this by typing regedit in the "start, Run menu. you can find the right registry key by going here
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]

[scottyL]

mtu is set to 1492
default rcv window is set to 256960
(i used the speedguide tweak and undid the drtcp settings)
dslreports tweak tester still says 1362
here's the report:
* Results
* Your public IP address isxxx.xx.xxx.xx
Hops left before discard (TTL) is 53
TCPopts hex string is 0204052a0103030201010402
Max Segment Size is 1322
* Your MTU is set ok
Window Scaling 2 bits (RFC1323)
SACK Permitted (RFC2018)
Ping stability - - - - - - - - - -
* You are not pingable
No packet loss test will be done
Scaled DefaultRcvWindow (RWIN) is 241408
Your RWIN limits you @200ms to 9656kbps
* Your RWIN is advertised as 241408 (scaling is on)
(Beyond 65k, advertised RWIN is scaled)
Your Path MTU Discovery is ON
Max sized data packet from you 1362
* Conclusion.. HEALTHY SETUP!
* End


[This message has been edited by scottyL (edited 01-14-2001).]

[dedub]

OK, What this means is that 1362 is the Max that your ISP or the first router in the network will accept before it partitions that packet. this number is good to know to tweak your RcvWindow setting. it should be a multiple of your MSS ie...4Xmss or 8Xmss.


(ps) there is a way to ping your isp and find that exact amount size packet it will handle. let me know if your interested

[This message has been edited by dedub (edited 01-14-2001).]