> a cable modem (eastern connecticut cable)
> a linksys router
> on either machine, he just can't get to some websites. Others he can
> get to fine.
> I walked him through pinging the sites, and the sites resolved fine
> (the domain name resolved to the proper IP)
> I walked him through tracert, and the sites that worked never had a
> segment take longer than 70ms. The sites that failed had segments that
> took 80-250ms, and the very last segment always timed out. (failed:
> theday.com, voiceinverse.com as examples)
That is usually due to a router/firewall blocking ICMP. And blocking ICMP in combination with cable (with tunneled protocol like PPPoE) waves a very big "Path MTU Discovery" flag.
>From the command line, try using "ping -l 1500 -f voiceinverse.com" and reduce the 1500 until you don't get any errors anymore. If that number is less for your father then for your sister, your father needs to change the registry to lower the MTU (see MS knowledge base).
RFC 1191 if you want to know what it all means.
Jochem
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