TTL vs RWIN

pino · Post by **pino** » Fri Sep 13, 2002 8:44 pm

Here the choose

Smaller RWIN with Bigger TTL Hops or

Bigger RWIN with Smaller TTL Hops ?

pino

earthmofo · Post by **earthmofo** » Sat Sep 14, 2002 10:35 am

It doesn't matter.

TTL or Time To Live is the number of hops (servers) a packet can travel to it's destination before it's dropped.

RWIN determines how much data the receiving computer can get and is not dependent on TTL.

pino · Post by **pino** » Sat Sep 14, 2002 8:54 pm

How the relation for speed ?

Because from TCP Op or DRTCP said you must set RWIN and TTL for optimized but we can't get really according to environment ?

pino

mnosteele52 · Post by **mnosteele52** » Sat Sep 14, 2002 8:58 pm

TTL is pretty much irrelevant to speed, RWIN has the most effect on speed and is based on your caps and possible latency.

pino · Post by **pino** » Sat Sep 14, 2002 9:08 pm

So for experiment we must set TTL to deffault (e.g 64 for Win98) and we only change RWIN ?

pino

mnosteele52 · Post by **mnosteele52** » Sat Sep 14, 2002 9:14 pm

You got it, RWIN has the most effect on your speed.

pino · Post by **pino** » Sat Sep 14, 2002 9:29 pm

I'll try !

tnx , pino

rmrucker · Post by **rmrucker** » Mon Sep 16, 2002 8:33 am

You don't want TTL too low with a large RWIN -- there will be a critical point if your RWIN greatly exceeds your bandwidth.

Think about it. If you have a HUGE RWIN and small bandwidth, the packets will have left the server and will be sitting in limbo for a long time waiting to get through the narrow pipe. If they sit in limbo too long, TTL will be exceeded.

SICMF · Post by **SICMF** » Mon Sep 16, 2002 8:37 am

Originally posted by rmrucker
You don't want TTL too low with a large RWIN -- there will be a critical point if your RWIN greatly exceeds your bandwidth.

Think about it. If you have a HUGE RWIN and small bandwidth, the packets will have left the server and will be sitting in limbo for a long time waiting to get through the narrow pipe. If they sit in limbo too long, TTL will be exceeded.

OK, What would be a good setting for a large RWIN like 3584000?