On Friday 05 March 2004 13:50, Niall O Broin wrote:
[snipped]
>> So, what's wrong with this scenario? Well, one thing is that I have
> wondered how dynamic DNS providers work at all. I'm no DNS expert either,
> but neither am I completely ignorant about DNS, and AFAICT can tell the
> only way dynamic DNS services can work is if they use DNS servers which
> update immediately, and use very short TTLs on their zones.
>
Yes short TTLs are typically used for dynamic dns. I use dyndns.org, and have
the TTL on dublinux.net's A record set to 1500. All other records are set to
86400 (1 day)
> However, I always understood that you shouldn't use very short TTLs except
> when about to change a domain to a different IP, as such TTLs are not net
> friendly. Also, some ISPs' caching servers have a tendency to ignore TTLs
> as specified in zones and cache for just as long as they feel like caching
> (Eircom was a particularly bad offender in this regard - I don't know if
> they still are).
>[snipped]
--
John Allen, mailto:john.allen at dublinux.net
MandrakeClub Silver Member. http://www.dublinux.net
Mandrake Linux release 10.0 (RC1) for i586, kernel 2.4.22-21mdk
14:03:17 up 27 days, 21:52, 1 user, load average: 0.01, 0.04, 0.01
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