Re: [rtcweb] FW: I-D Action: draft-muthu-behave-consent-freshness-03.txt
"Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com> Thu, 28 February 2013 17:45 UTC
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From: "Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com>
To: Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [rtcweb] FW: I-D Action: draft-muthu-behave-consent-freshness-03.txt
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Date: Thu, 28 Feb 2013 17:45:28 +0000
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] FW: I-D Action: draft-muthu-behave-consent-freshness-03.txt
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|Imagine that you are running Tr at 1 second, with a complete |transaction required before you do anything. Do you run 39 in |parallel with hundreds of checks, or do you not create a new |transaction when another is outstanding? Yes, that's what I had in mind -- don't generate a new request when a response is pending. A couple more constraints that could be useful: - Don't generate a new consent freshness check when no traffic was sent over the last x sec (could save battery). - Don't generate a new liveness check if any traffic was received since the last liveness check. I had a crude algorithm: http://www.ietf.org/mail-archive/web/rtcweb/current/msg05000.html Need to refine further. |We've discussed tightening the timers once the session is live. We've |also discussed tightening timers when the session is starting. Both |of which I would have expected to see in the document as proposed |solutions. Not sure I understood. Do you mean tightening the backoff timer? |I think that the document only needs to talk in terms of "checks" or |Binding requests rather than transactions. How would that help? They would degenerate into transactions, anyway. Muthu |-----Original Message----- |From: Martin Thomson [mailto:martin.thomson@gmail.com] |Sent: Thursday, February 28, 2013 1:14 AM |To: Muthu Arul Mozhi Perumal (mperumal) |Cc: rtcweb@ietf.org |Subject: Re: [rtcweb] FW: I-D Action: draft-muthu-behave-consent-freshness-03.txt | |> In its current form, the draft uses the STUN transaction as defined in RFC5389, which implies the |requests are retransmitted until a response is received, or until a total of 7 requests have been sent |(assuming no hard ICMP error is received). So, reporting a consent freshness failure is sufficiently |guarded against transitory network failures. | |That's far too much. And the backoff is designed for completely |different situations. | |Imagine that you are running Tr at 1 second, with a complete |transaction required before you do anything. Do you run 39 in |parallel with hundreds of checks, or do you not create a new |transaction when another is outstanding? Keep in mind that the latter |choice means that you aren't really sending a check every second any |more, despite agreeing to do so. | |> However, with the default 500 ms RTO recommended in RFC5389, it would take 39.5 sec for the |transaction to timeout -- this was considered too long to declare a consent freshness failure. | |We've discussed tightening the timers once the session is live. We've |also discussed tightening timers when the session is starting. Both |of which I would have expected to see in the document as proposed |solutions. | |> One option could be to define a new STUN transaction that doesn't do the exponential backoff for |retransmission, but instead retransmits at periodic intervals and declare failure if there is no |response after sending a bunch of them, as you are suggesting. But, I am not sure at this point how |that would be both superior compared to the transaction defined in RFC5389 and sufficiently guard |against transitory network failures. | |I think that the document only needs to talk in terms of "checks" or |Binding requests rather than transactions.
- [rtcweb] FW: I-D Action: draft-muthu-behave-conse… Muthu Arul Mozhi Perumal (mperumal)
- Re: [rtcweb] FW: I-D Action: draft-muthu-behave-c… Martin Thomson
- Re: [rtcweb] FW: I-D Action: draft-muthu-behave-c… Muthu Arul Mozhi Perumal (mperumal)
- Re: [rtcweb] FW: I-D Action: draft-muthu-behave-c… Martin Thomson
- Re: [rtcweb] FW: I-D Action: draft-muthu-behave-c… Muthu Arul Mozhi Perumal (mperumal)
- Re: [rtcweb] FW: I-D Action: draft-muthu-behave-c… Martin Thomson
- Re: [rtcweb] FW: I-D Action: draft-muthu-behave-c… Salvatore Loreto