[c-nsp] some WCCP questions

[Adrian Chadd]

On Tue, Sep 01, 2009, Dracul wrote:
> Hi,
> 
> Followup question regarding WCCP.
> 
> How long does it take to refresh cached data in squid? Will wccp be able to
> detect if the cached data is already a few hours old? Lets say
> for news websites that are cached. Thanks!

That's a question for squid-users@, not cisco-nsp. But the answer is
"it depends on the http caching semantics the site presents and how you
have configured squid."



Adrian

> 
> regards,
> Chris
> 
> On Tue, Sep 1, 2009 at 3:36 PM, Dracul <chris.garzon at gmail.com> wrote:
> 
> > Thanks adrian,
> >
> > >That takes time - the WCCPv2 router will take a while to time out the
> > >now-unreachable server. It would be possible to hack in some code to try
> > >sending a last "gasping breath" packet to the WCCPv2 router to say the
> > >cache is about to disappear, but it won't save existing connections.
> >
> > So will user in the network , "feel" the turnover of packets like they
> > would  just have some momentary
> > lapse of connection (browsing or downloading via http)
> >
> >
> >
> > On Tue, Sep 1, 2009 at 2:52 PM, Adrian Chadd <adrian at creative.net.au>wrote:
> >
> >> On Tue, Sep 01, 2009, Dracul wrote:
> >> > Hi List,
> >> >
> >> > I'm planning to setup WCCP + Squid.
> >>
> >> Hi!
> >>
> >> > If the squid server should be offline or the squid process dies, will
> >> the
> >> > users? port 80 requests automatically redirect to the ?live? internet
> >> > connection??
> >>
> >> Yes!
> >>
> >> > Because in old "forced" redirection configurations, if the squid process
> >> > dies or should the squid server be unreachable for some reason, user
> >> will
> >> > see a browser error.
> >>
> >> Indeed.
> >>
> >> > >From what I understand with WCCP documentation,  if the squid dies or
> >> the
> >> > server is unreachable, the network should automatically redirect the
> >> users
> >> > to the gateway, without
> >>
> >> That takes time - the WCCPv2 router will take a while to time out the
> >> now-unreachable server. It would be possible to hack in some code to try
> >> sending a last "gasping breath" packet to the WCCPv2 router to say the
> >> cache is about to disappear, but it won't save existing connections.
> >>
> >> > any disruption of any kind to their browsing experience. Are my
> >> assumptions
> >> > correct? Thanks!
> >>
> >>
> >>
> >> adrian
> >>
> >>
> >> --
> >> - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid
> >> Support -
> >> - $25/pm entry-level VPSes w/ capped bandwidth charges available in WA -
> >>
> >
> >
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