I'm using stunnel to pass some data through an Amazon ELB. Unfortunately, there are times when the session times out due to packets not passing for 60 seconds (an amazon ELB timeout). I'm wondering whether theres some way I can configure stunnel itself to pass some whitespaces or something back and forth every few seconds to make sure the session stays open and live?
(and yes, I'm posing the same question to the app developer who's ap we're passing through.. but I'm looking at both avenues.. )
On Thu, 2011-04-07 16:04:56 -0700, Matt Wise wrote:
I'm using stunnel to pass some data through an Amazon ELB. Unfortunately, there are times when the session times out due to packets not passing for 60 seconds (an amazon ELB timeout). I'm wondering whether theres some way I can configure stunnel itself to pass some whitespaces or something back and forth every few seconds to make sure the session stays open and live?
I'm not sure what an ELB is actually doing and if this would help in your case, but did you try to enable TCP_KEEPALIVE?
Ludolf
So, for now I've used the 'Mark' line to test and prove that I can keep the connectin open for hours, days, etc.. But it fills up our logs with junk, that I'm semi-OK with, but would ideally avoid. Any way to do the same thing, but send a whitespace or something?
As for the keepalive, I've got the tcp-keep-alive(yes) set, as well as keep-alive(yes) set... but it doesnt seem to do anything. As I understand it, Amazon deliberately igonres SO_KEEPALIVE packets..
—Matt
On Apr 8, 2011, at 12:52 AM, Ludolf Holzheid wrote:
On Thu, 2011-04-07 16:04:56 -0700, Matt Wise wrote:
I'm using stunnel to pass some data through an Amazon ELB. Unfortunately, there are times when the session times out due to packets not passing for 60 seconds (an amazon ELB timeout). I'm wondering whether theres some way I can configure stunnel itself to pass some whitespaces or something back and forth every few seconds to make sure the session stays open and live?
I'm not sure what an ELB is actually doing and if this would help in your case, but did you try to enable TCP_KEEPALIVE?
Ludolf
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