nanog mailing list archives
Re: Intermittent incorrect DNS resolution?
From: Erik Levinson <erik.levinson () uberflip com>
Date: Wed, 16 Jan 2013 17:26:43 -0500
Good point.While I haven't checked the distribution of source IPs yet, I briefly grepped for the User-Agent headers in the tcpdump output, and there's a higher than expected bot presence, particularly Baidu.
That said, there are also "normal" UAs (whatever that means, with every device/software pretending to be something else these days).
On 16/01/13 05:20 PM, RijilV wrote:
Also client programs don't always honor TTLs either. For example, JAVA defaults to ignoring TTLs and holding IPs forever. *networkaddress.cache.ttl (default: -1)* Indicates the caching policy for successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the successful lookup. A value of -1 indicates "cache forever". Depending on who your clients are, your milage may vary. .r'
Current thread:
- Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? George Herbert (Jan 16)
- Re: Intermittent incorrect DNS resolution? RijilV (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? RijilV (Jan 16)
- Re: Intermittent incorrect DNS resolution? Christopher Morrow (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? Christopher Morrow (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? Joe Abley (Jan 16)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? Damian Menscher (Jan 17)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 17)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 17)
- Re: Intermittent incorrect DNS resolution? Erik Levinson (Jan 16)
- Re: Intermittent incorrect DNS resolution? George Herbert (Jan 16)