Question on Loosely Synchronized Router Clocks

Bora Akyol bora.akyol at
Tue Sep 18 16:09:58 UTC 2007

You can check freshness of a message by means of sequence numbers, no?


On 9/18/07 8:55 AM, "Xin Liu" <smilerliu at> wrote:

> Ideally, yes, a protocol should not rely on clock synchronization at
> all. However, to ensure freshness of messages, we don't have many
> choices, and clock synchronization seems to be the least painful one.
> So we asked about router clocks on the current Internet. If normally
> router clocks are synchronized and we have a mechanism to detect and
> fix out-of-sync clocks, is it reasonable to assume clock
> synchronization in the rest of our design?
> Best
> Regards,
> Xin Liu
> On 9/17/07, Bora Akyol <bora.akyol at> wrote:
>> IMHO:
>> What ever solution you end up proposing should able to handle (3) and should
>> work with arbitrary boundaries for (1) & (2).
>> We don't want to add another failure mode to the network that depends on
>> time synchronization.
>> You don't want to shift the problem from BGP to NTP.
>> Regards
>> Bora

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