View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0001236||unreal||ircd||public||2003-09-06 20:22||2005-02-03 20:10|
|Platform||x86||OS||Windows XP Pro|
|Fixed in Version||3.2.3|
|Summary||0001236: nodnscache / resolver TTL bug|
|Description||During 1 or 2 days, all links which have the nodnscache option can be linked. After one more day, I'm unable to link to any server because they have dynamics IPs. These servers have all the nodnscache option. I looked IP shown by the ircd when I did /raw close, they were different than the current dns lookup. So I think there's a bug : UnrealIRCd keeps an ip <=> hostname cache even if nodnscache is present in the link block, but it seems don't keep a cache while 1 or 2 days following the IRCd boot.|
I have a link block to `aub.ath.cx' :
Before this afternoon, each time I did /connect aub* :
*** Resolving hostname 'aub.ath.cx'...
*** Notice -- Connecting to aub.ath.cx[aub.ath.cx].
Since some hours and always currentely :
*** Connecting to aub.ath.cx[aub.ath.cx].
Do : /raw close
aub.ath.cx[@220.127.116.11.0] Closed. Status = -6
1: Connections Closed
IRCd was connecting to: 18.104.22.168
at this time, nslookup on aub.ath.cx return 22.214.171.124 .
IRCd doesn't more resolve host of servers I want to connect.
I tried with some others servers were present in my configuration : IRCd took old IP of hostnames.
|Tags||No tags attached.|
|3rd party modules|
You are correct in saying that it does still cache it somehow (in DNS cache, instead of in both DNS cache and link block 'cache'), but... this shouldn't be a problem for dyndns.org/ath.cx which all have a TTL (time to live) of 1 minute which is in practice 5-10 minutes.
Could you do a "/quote dns l" (as ircop) to show all cached dns entries and see if it is listed there (either as ip or as hostname)?
edited on: 09-06-03 21:03
"/quote dns l" effectued:
*** Notice -- Genius did a DNS cache list
Ex 45450 ttl 86400 host voltaire-101-1-212.net1.nerim.net(126.96.36.199)
voltaire-101-1-212.net1.nerim.net = aub.ath.cx (CN)
and there is the old IP of aub.ath.cx .. if I have understood, ttl = 86400 secs, then 1 day ?
Yeah I think I've spotted this "aliasing" bug earlier.. it somehow likes to combine those 2 things together (the .ath.cx and the real host) and then uses the TTL of the real host.. == bad/bug :/.
edited on: 09-06-03 21:25
||This might take some time to fix. Also I'm marking this bug private.|
||I think this got fixed in recent CVS. Or at least a stupid aliasing (CNAME) bug got fixed, which would affect caching.|
|2003-09-06 20:22||gen_||New Issue|
|2003-09-06 21:01||syzop||Note Added: 0003612|
|2003-09-06 21:02||syzop||Note Edited: 0003612|
|2003-09-06 21:03||syzop||Note Edited: 0003612|
|2003-09-06 21:21||gen_||Note Added: 0003613|
|2003-09-06 21:25||syzop||Note Added: 0003614|
|2003-09-06 21:25||syzop||Note Edited: 0003614|
|2003-09-06 21:27||syzop||Status||new => confirmed|
|2003-09-06 21:27||syzop||Summary||link::options::nodnscache bug => nodnscache / resolver TTL bug|
|2003-09-08 16:08||syzop||Note Added: 0003627|
|2003-09-08 16:08||syzop||View Status||public => private|
|2005-02-03 20:09||syzop||Status||confirmed => resolved|
|2005-02-03 20:09||syzop||Resolution||open => fixed|
|2005-02-03 20:09||syzop||Assigned To||=> syzop|
|2005-02-03 20:09||syzop||Note Added: 0009015|
|2005-02-03 20:09||syzop||Fixed in Version||=> 3.2.3|
|2005-02-03 20:10||syzop||View Status||private => public|