Lobo, Speaking of CPU Mhz.......

Prey521 · Post by **Prey521** » Fri Apr 06, 2001 10:15 pm

How big would you recommend my RWIN to be if I have a Pentium 3 550 MHZ? it is currently at 512512.

TCP options string = 020405b00103030301010402

MTU = 1496
MTU is fully optimized for broadband.

MSS = 1456
Maximum useful data in each packet = 1456, which is equal to MSS.

Default Receive Window (RWIN) = 512512
RWIN Scaling (RFC1323) = 3 bits
Unscaled Receive Window = 64064
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
256256 (MSS x 44 * scale factor of 4)
128128 (MSS x 44 * scale factor of 2)
64064 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 20500.48 kbps (2562.56 KBytes/s) @ 200ms
Your RcvWindow limits you to: 8200.192 kbps (1025.024 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 52 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

[ 04-06-2001: Message edited by: Prey521 ]

Lobo · Post by **Lobo** » Fri Apr 06, 2001 10:21 pm

Well it's kinda borderline try 481800 and in morning see which you like best

Prey521 · Post by **Prey521** » Fri Apr 06, 2001 10:28 pm

Thanx Wolfman, I'll give that a shot and see

Lobo · Post by **Lobo** » Fri Apr 06, 2001 10:34 pm

Size

Lobo · Post by **Lobo** » Fri Apr 06, 2001 10:39 pm

Prey that number goes with MTU 1500, MSS 1460

Prey521 · Post by **Prey521** » Sat Apr 07, 2001 12:31 am

Originally posted by Lobo:
Prey that number goes with MTU 1500, MSS 1460

Which number? 481800 or 512512?

Prey521 · Post by **Prey521** » Sat Apr 07, 2001 3:41 am

^^^^^

Lobo · Post by **Lobo** » Sat Apr 07, 2001 7:12 am

481800 , MTU 1500, MSS 1600

Prey521 · Post by **Prey521** » Sat Apr 07, 2001 2:23 pm

Hey Lobo, my MTU is 1496, if I set it at 1500 I get the packet fragmentation error, so I prefer to leave it at 1496. Would there be a better rwin to use with an MTU of 1496?

Lobo · Post by **Lobo** » Sat Apr 07, 2001 2:32 pm

Try 496496, maybe or maybe not

Lobo · Post by **Lobo** » Sat Apr 07, 2001 2:53 pm

Or 480480, don't worry because they are smaller, it may make you faster