Firefox invalidate dns cache [closed]

问题:

I was too quick about visiting a site I set up on a customer server, and Firefox now remembers, that the default site for (example)

testsite.mycompanyname.com (non existing subdomain, same as *.mycompanyname.com)

is

www.mycompanyname.dk - or rather the IP of the default server

I have then later set up the public DNS (a-record) to redirect to another server, but Firefox remembers the default IP adress.

Chrome/IE/Safari - no problem, as they have not visited that site before DNS kicked in...

I have set these in about:config:

network.dns.disablePrefetch = true
network.dnsCacheExpiration = 0

Anything else?

I really need firebug to debug the frontend on that site....

Cheers

回答1:

DNS caching occurs at multiple levels: Application asks local system, which asks locally configured resolving DNS server, which asks authoritative DNS servers.

Caching by Application varies.

• I've found for Firefox that quitting and restarting works. The relevant settings in about:config are network.dnsCacheEntries and network.dnsCacheExpiration, which can be set to 0 in order to disable caching.

Caching by local system is typically 1 hour.

• Diagnostic: ping, like other applications, uses local system DNS cache
• Flush MacOsX 10.8: sudo killall -HUP mDNSResponder (reference)
  (May vary for other versions)
• Flush Windows: ipconfig /flushdns (only if the DNS caching service, HKLM\SYSTEM\CurrentControlSet\Services\Dnscache, is enabled; check with net start|findstr /i dns or compmgmt.msc)
• Linux/Unix may use nscd (name services caching daemon), or dnsmasq, or both ...

Caching by local resolving DNS server may run to several days, depending on TTL associated with DNS record.

• Diagnostic: nslookup first reports address of resolving server, then address requested.
• Flush BIND: rndc flush or rndc flushname DOMAIN.NAME

TTL stands for "time to live" a term used to describe how long a DNS record is to be deemed valid by the requesting client or server. A short TTL means that the requester is told not to cache a DNS lookup for too long. The TTL can range from mere seconds (e.g. for DynDNS and similar) to days or weeks.

回答2:

I've been using the "Clear Recent History\cache" solution for a while now, but I've noticed that it stopped working after one of firefox updates (probably 20.0.1). Because of that I've switched to https://addons.mozilla.org/en-US/firefox/addon/dns-cache/ add-on to do the DNS clearing. I hope this will help someone with the same problem.

Edit: Changed the url as suggested by Haozhun.

Edit2: Unfortunately as of FireFox 32, this plugin is no longer compatible and cannot be used. Possibly https://addons.mozilla.org/en-US/firefox/addon/dns-flusher/ might be able to replace it.

回答3:

Install the addon DNS Flusher, which works for me.

回答4:

The following methods, which worked at some point, do not work presently (doing all of them doesn't work):

• Restarting the browser
• Clearing the browser cache
• Setting network.dnsCacheExpiration=0
• ipconfig /flushdns

However, you can open a new private window, private windows evidently don't use the same DNS cache as the regular windows (which is comforting).

回答5:

I found that network.dnsCacheExpiration = 0 alone did not quite do the trick, but if you also set network.dnsCacheEntries = 0 then the DNS cache gets disabled for good. So:

network.dnsCacheEntries = 0
network.dnsCacheExpiration = 0