[squid-users] Bad Connection & Round Robin DNS

[Jiann-Ming Su]

Is there a way to set the timeout on a bad connection?  When watching tcpdump on the two IPs, I did not see my squid instance try the other IP automatically.  I had to refresh my web browser connection multiple times.  This also indicates some DNS caching persistence.  Are there other DNS settings that can improve this behavior?  Thanks for your tips.



> On Monday, November 21, 2016 11:54 PM, Garri Djavadyan <garryd at comnet.uz> wrote:
> > On Tue, 2016-11-22 at 03:59 +0000, Jiann-Ming Su wrote:
> 
>>  If a website has two (or more) IP addresses, and the TCP connection
>>  to one of them fails, can squid3 be configured to try the other IP
>>  address(es)?
> 
> Hi,
> 
> The behavior you described is default for Squid. For example, you can
> set 'debug_options ALL,1 14,9' to confirm it:
> 
> 2016/11/22 09:47:50.426 kid1| 14,3| ipcache.cc(433) ipcacheParse:
> ipcacheParse: mail.ru #0 [2a00:1148:db00:0:b0b0::1]
> 2016/11/22 09:47:50.426 kid1| 14,3| ipcache.cc(422) ipcacheParse:
> ipcacheParse: mail.ru #1 94.100.180.199
> 2016/11/22 09:47:50.426 kid1| 14,3| ipcache.cc(422) ipcacheParse:
> ipcacheParse: mail.ru #2 94.100.180.201
> 2016/11/22 09:47:50.426 kid1| 14,3| ipcache.cc(422) ipcacheParse:
> ipcacheParse: mail.ru #3 217.69.139.199
> 2016/11/22 09:47:50.426 kid1| 14,3| ipcache.cc(422) ipcacheParse:
> ipcacheParse: mail.ru #4 217.69.139.200
> 2016/11/22 09:47:50.426 kid1| 14,9| comm.cc(646) comm_connect_addr:
> connecting to: [2a00:1148:db00:0:b0b0::1]:80
> 2016/11/22 09:47:50.427 kid1| 14,2| ipcache.cc(924) ipcacheMarkBadAddr:
> ipcacheMarkBadAddr: mail.ru [2a00:1148:db00:0:b0b0::1]:80
> 2016/11/22 09:47:50.427 kid1| 14,3| ipcache.cc(889) ipcacheCycleAddr:
> ipcacheCycleAddr: mail.ru now at 94.100.180.199 (2 of 5)
> 2016/11/22 09:47:50.427 kid1| 14,9| comm.cc(646) comm_connect_addr:
> connecting to: 94.100.180.199:80
> 2016/11/22 09:48:50.036 kid1| 14,2| ipcache.cc(924) ipcacheMarkBadAddr:
> ipcacheMarkBadAddr: mail.ru 94.100.180.199:80
> 2016/11/22 09:48:50.036 kid1| 14,3| ipcache.cc(889) ipcacheCycleAddr:
> ipcacheCycleAddr: mail.ru now at 94.100.180.201 (3 of 5)
> 2016/11/22 09:48:50.036 kid1| 14,9| comm.cc(646) comm_connect_addr:
> connecting to: 94.100.180.201:80
> 2016/11/22 09:49:50.091 kid1| 14,2| ipcache.cc(924) ipcacheMarkBadAddr:
> ipcacheMarkBadAddr: mail.ru 94.100.180.201:80
> 2016/11/22 09:49:50.091 kid1| 14,3| ipcache.cc(889) ipcacheCycleAddr:
> ipcacheCycleAddr: mail.ru now at 217.69.139.199 (4 of 5)
> 2016/11/22 09:49:50.092 kid1| 14,9| comm.cc(646) comm_connect_addr:
> connecting to: 217.69.139.199:80
> 2016/11/22 09:50:50.152 kid1| 14,2| ipcache.cc(924) ipcacheMarkBadAddr:
> ipcacheMarkBadAddr: mail.ru 217.69.139.199:80
> 2016/11/22 09:50:50.153 kid1| 14,3| ipcache.cc(889) ipcacheCycleAddr:
> ipcacheCycleAddr: mail.ru now at 217.69.139.200 (5 of 5)
> 2016/11/22 09:50:50.153 kid1| 14,9| comm.cc(646) comm_connect_addr:
> connecting to: 217.69.139.200:80
> 
> 
> Garri
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