Max MTU test question.

[flyerI]

TCP options string = 020405b40103030201010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 256960
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 64240
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 10278.4 kbps (1284.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4111.36 kbps (513.92 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 51 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000


Question: When I do the MaxMTU test on TCP Optimizer I get a Request Time Out on the "Pinging xxxxx with 1125 bytes" This happens on both my rigs at home but my laptop yeilds a result. My speed test results are in the mid to high 1900's on RoadRunner with a 2000 cap. Am I geting all I am supposed to even with theis MTU thing?

[mnosteele52]

What site are you trying to ping? The site could be busy, try pinging another site and see what you get. If it times out alot or is high (over 200ms) you may need to call your ISP and have things checked out.:)

[flyerI]

I have tried Adobe.com, att.net, and others. On adobe I get about 232 ping with 32 and 75 bytes. On att I get 64 on 32 and 75. I can immediately run the test on my laptop and get results. I have set TCP optimizer to the same settings on all three machines. I am gettin very close to my cap downloading and about 350 uploading so should I ignore the MTU test results?

[mnosteele52]

Try a tracert test and see if there is a problem somewhere.:)