If you do this, you should be absolutely sure that caching is going to do the right thing in all cases. Any other names are discarded.

Consider what will happen if a name cannot be found. ping/nbtstat/nslookup don't work up vote 0 down vote favorite Note: Windows environment (servers & workstations): I'm having a small issue here at work where a server went down and the (not How do you define sequences that converge to infinity? http://thedroidblog.com/failed-to/failed-to-create-host-only-network-interface-virtualbox.html For backwards compatibility, net- is still recognized for query-style lookups, but its presence or absence has no effect. (Of course, for single-key lookups, net- is important.

For example, it is conventional to define a domain list called local_domains for all the domains that are handled locally on a host, using a configuration line such as domainlist local_domains For example: domainlist special_domains = \ ${lookup{$sender_host_address}cdb{/some/file}} This provides a list of domains that depends only on the sending host’s IP address. linux windows networking ip hostname share|improve this question edited Apr 23 '14 at 8:55 user130370 asked Nov 25 '09 at 4:41 billyduc 69261725 add a comment| 6 Answers 6 active oldest Browse other questions tagged networking dns ip ping hostname or ask your own question.

Because of the problems of determining host names from IP addresses, matching against host names is not as common as matching against IP addresses. What is the "crystal ball" in the meteorological station? My ideas are: Ask the DHCP server with a remote command (though, I'm sure my AD user has no access to login to it :P) Read the DNS cache (we had Here is another example which shows an IPv4 and an IPv6 network: recipient_unqualified_hosts = 192.168.0.0/16: \ 3ffe::ffff::836f::::/48 The doubling of list separator characters applies only when these items appear inline in

Hosts can be identified in two different ways, by name or by IP address. If you want to do lookups based on IP addresses, you must precede the search type with “net-” (see section 10.12). To check host name resolution configuration In Control Panel, click the Network and Dialup Connection icon. Useful Searches Recent Posts Resources Resources Quick Links Search Resources Most Active Authors Latest Reviews Feature Requests Defects Menu Log in Sign up The Community Forums Interact with an entire community

A brief summary of how DNS resolves host names is provided in this section. This restriction does not apply to query-style lookups. exim - failed to find host name from IP address Discussion in 'General Discussion' started by pfmartin, Feb 14, 2002. Named lists may have a performance advantage.

Outlook as usual gives some error that has nothing to do with anything or any entry in the KB that gives no real information. When in doubt, leave it out.

8. Forum New Posts FAQ Calendar Forum Actions Mark Forums Read Quick Links Today's Posts View Site Leaders Advanced Search Forum Technical Discussion E-Mail Exim log - failed to find host name As discussed in the appendix "LMHOSTS File" in this book, the LMHOSTS file is parsed sequentially from the top to locate entries without the #PRE keyword.

If there is a temporary problem (such as a DNS timeout) with the host name lookup, a temporary error occurs. For example: accept hosts = +ignore_unknown : friend.example : \ 192.168.4.5 accepts from any host whose name is friend.example and from 192.168.4.5, whether or not its host name can be found.

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