On Monday, March 14, 2005, 5:03:31 PM, Matthew Eerde wrote:
Jeff Chan wrote:
On Friday, March 11, 2005, 2:30:05 PM, Matthew Eerde wrote:
Jeff Chan wrote:
On Friday, March 11, 2005, 4:33:45 AM, Chris Edwards wrote:
I wonder if there'd be much mileage in a SpamAssaassin feature to award points for any URLs that don't resolve ?
In principle it's something that could be done, but the timeouts encountered trying to resolve non-existent domains could make it impractical.
Aren't the name resolution attempts done in parallel?
Even if they are, there needs to be a reasonable timeout on resolution set, like 10 seconds. That may not seem like a very long delay, but it can keep open server memory allocations, etc.
I see your point.
"No such domain" and "no such entry at this domain" responses are very fast, though. Couldn't at least quick negative responses be worth points? Could use a timeout of one or two seconds to save server resources - with a timeout not being worth points at all.
Yes, assuming the additional checks network-wide didn't slow down the root name servers. Scalability should be considered.
http://www.caida.org/projects/dns-analysis/index.xml http://www.nanog.org/mtg-0210/ppt/duane.pdf http://dns.measurement-factory.com/tools/dnstop/
Jeff C. -- "If it appears in hams, then don't list it."