Re: RE: High Speed Firewalls

[Jonathan Rozes <jrozes () vinton com>]

On Thu, 23 Mar 2000, Mikael Olsson wrote:

> Actually, no. The TCP Window Scaling option (WSOPT) defined in 
> RFC 1323 can scale the window size up to 2^256 times. It was
> implemented to cope with the concept of "Long Fat Networks",
> meaning high throughput, high delays. 

Are you sure? By my reading it makes the max window size 2**30, or 1GB.

> Unfortunatelly, increasing the window size eats a hell of a 
> lot of RAM on the sender end, so I don't know of many places
> that actually use it, and I don't know which OSes support
> it. I'd suspect a lot of *nix flavours do (atleast I keep
> seeing WSOPTs in their SYN packets), and that.. uhmmm. some 
> big commercial OSes don't.

Neither NT4 nor MacOS support it. Win98, Win2k and probably MacOS X 
support it though. Most unices support it as well.

jonathan

+++ Jonathan Rozes, System Administrator, Will Vinton Studios