On 06/15/99 01:23:16 PM Vadim Antonov wrote:

Brett_Watson@enron.net wrote:

...

and how does caching magically negate security and scalability concerns?

Caching is not employing any routing information exchange. Therefore it is a) oblivious to the state of other caches or to the changes in network topology and b) is invulnerable to the bogus routing information and flap-like DoS attacks.

i'll give you that. however, caches tend to run under unix-like os's which are multi-user and multi-service machines. they can be susceptible to DoS attacks, and can be running services listening on a port which can potentially be "hacked". my only point is that you are trading a set of security issues in multicast for *different* security issues with a cache.

...

what tools are you using to do content replication/management that scale

to

...

thousands of hosts/caches?

99% of Web content is write-once. It does not need any fancy management. The remaining 1% can be delivered end-to-end.

it's very different in our network. we have lots of static content (on-demand real-video, mpeg, etc) which is injected to a set of distributed servers around the network from content originators. the content originators may be traditional content providers such as those found on the internet but they may be a 3-letter television networks (broadcast television), post-production video houses, etc. we have to do content management, aging, etc for large volumes of data. we also have to keep systems synchronized with content (contrary to your next statement which i don't agree with).

In this case, i just do not care to go into details of implementations.

The

L2/L3 mcasting is not scalable and _cannot be made_ scalable for reasons having nothing to do with deficiencies of protocols.

Caching algorithms do not have similar limitations, solely because they do not rely on distributed computations. So they have a chance of working. Of course, nothing "just works".

right, they don't have "similar limitation" they have *different* limitations which wasn't what you seemed to be saying. -brett