ASA and Unix/Windows Scaling

[robert.horrigan]

HI,

I have Windows 2003, Solaris, HP-UX, and Windows 2008 servers that have non-default window sizes setup to help increase file transfer times.  These servers are behind an ASA and copy to mirror servers behind another ASA.  When I run a cap on these servers behind the ASA I see that the window size is what they manually set it to, i.e. 100KB/200KB.  When I run a cap infront of the ASA I see the Window size as 64KB.  Does the ASA modify the window size by default?  Does anyone have a config example how to resolve this?

[Kureli Sankar · Accepted solution]

Is this traffic inspected by the firewall? port? protocol?

If so, take a look at http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsz11180

and see if it applies.

-KS

[robert.horrigan]

KS - thanks.  It actually turned out to be an ACE loadbalancer.  Cant believe they clear TCP options by default