On 2 December 2011 01:01, Jenny Lee <bodycare_5@xxxxxxxx> wrote: > p4$ host download.windowsupdate.com > mscom-wui-any.vo.msecnd.net has address 70.37.129.251 > mscom-wui-any.vo.msecnd.net has address 70.37.129.244 > > p12$ host download.windowsupdate.com > a26.ms.akamai.net.0.1.cn.akamaitech.net has address 92.123.69.42 > a26.ms.akamai.net.0.1.cn.akamaitech.net has address 92.123.69.8 > a26.ms.akamai.net.0.1.cn.akamaitech.net has address 92.123.69.24 > a26.ms.akamai.net.0.1.cn.akamaitech.net has address 92.123.69.26 > a26.ms.akamai.net.0.1.cn.akamaitech.net has address 92.123.69.41 Note also that this can change very rapidly. I've seen Windows Update DNS TTLs of 300 seconds and yes, the destinations changed on expiry. That said, I've had a squid cache for several hundred devices with the primary destinations of Apple/Windows updates (it's a tech support group and they're constantly imaging/updating machines) for months and they Just Work. The proxy is inline, running in intercept mode on their firewall. kmw
