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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Jonathan Yarden @ TechRepublic: Disable DNS caching onworkstations
Aside from individual OS behavior, doesn't this seem like very bad advice? What sort of DNS cache poisoning attack could possibly work against a workstation that has a caching resolver but no DNS server? If a hacker really wished to do a name resolution attack against workstations, wouldn't they just write some spyware that injected a hosts file? Seems easier. At any rate, wouldn't disabling caching/not paying attention to TTLs have a truly adverse impact on the DNS infrastructure? What is the % difference in incremental DNS server load between a host that obeys TTLs and one that not, but makes a new query each time? A single host wouldn't have much impact - how about a couple million? Is there something I'm missing here that's motivating Yarden's advice? - Dan </head scratching> On 4/18/05 1:35 PM, "Chris Adams" <[email protected]> wrote: > > Once upon a time, Patrick W. Gilmore <[email protected]> said: >> Depends on what you call "caching". Does honoring a TTL qualify as >> caching? > > What other kind of DNS caching is there? > >> Can you imagine what would happen if every time anyone ever looked up >> any hostname they sent out a DNS query? > > That's what most Unix/Linux/*BSD boxes do unless they are running a > local caching name service of some time (BIND, nscd, etc.). I wasn't > actually aware that Windows had a DNS cache service.
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