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*nix Thread, Censornet Internet down for 1 minute every half hour?!? in Technical; This is a weird one! We have had Censornet 3r1 running for 18 months with no problems. Recently a teacher ...
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    Alis_Klar's Avatar
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    Censornet Internet down for 1 minute every half hour?!?

    This is a weird one! We have had Censornet 3r1 running for 18 months with no problems. Recently a teacher has been reporting that the internet for the kids (via Censornet) will go down every half hour for 1 minute. This is like clockwork every half hour. MY guess is that some sort of housekeeping script or other process is doing this.

    As a stab in the dark have done a
    Code:
    crontab -l
    for users admin,root and postgres. Can't
    Code:
    su
    to nobody don't know the password. Any ideas?

    Also as an aside does anyone know when the new open source (as oposed to paidfor v4) version of censornet is out?

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    Geoff's Avatar
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    Re: Censornet Internet down for 1 minute every half hour?!?

    Cron logs what it is up to into the syslog. Check in /var/logs/ for a cron logfile or the generic syslog/messages logs.

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    ChrisH's Avatar
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    Re: Censornet Internet down for 1 minute every half hour?!?

    The most current version is 3.3r6 maybe you should consider upgrading as even r6 is pretty old.

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    Re: Censornet Internet down for 1 minute every half hour?!?

    Sorry Actually running 3.3r5. Will try those logs thanks Geoff.

    @Geoffo you think i'm on the right track here in suspecting crontab?

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    Re: Censornet Internet down for 1 minute every half hour?!?

    It's the only thing on the box that could affect things so regularly. The only other possibility is something external.

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    Re: Censornet Internet down for 1 minute every half hour?!?

    Hi, There doesn't seem to be anything fishy here. The internet access is affected at 28 and 58 past the hour.

    Code:
    Oct 10 12:25:01 censornet /USR/SBIN/CRON[21029]: (root) CMD (/usr/local/sbin/process_web_logs.pl /usr/local/squid/logs/access$
    Oct 10 12:25:01 censornet /USR/SBIN/CRON[21031]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 12:25:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:25:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:30:01 censornet /USR/SBIN/CRON[25246]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 12:30:01 censornet /USR/SBIN/CRON[25247]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 12:30:03 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:30:03 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:35:01 censornet /USR/SBIN/CRON[6367]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 12:35:01 censornet /USR/SBIN/CRON[6369]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/mr$
    Oct 10 12:35:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:35:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:35:46 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 12:35:46 censornet kernel: br0: topology change detected, propgating
    Oct 10 12:36:03 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 12:36:03 censornet kernel: br0: topology change detected, propgating
    Oct 10 12:36:45 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 12:36:45 censornet kernel: br0: topology change detected, propgating
    Oct 10 12:36:49 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 12:36:49 censornet kernel: br0: topology change detected, propgating
    Oct 10 12:37:20 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 12:37:20 censornet kernel: br0: topology change detected, propgating
    Oct 10 12:38:01 censornet /USR/SBIN/CRON[14306]: (root) CMD (/usr/local/sbin/process_denied_logs.pl /var/log/dansguardian/acc$
    Oct 10 12:40:01 censornet /USR/SBIN/CRON[19287]: (root) CMD (/usr/local/sbin/process_web_logs.pl /usr/local/squid/logs/access$
    Oct 10 12:40:01 censornet /USR/SBIN/CRON[19288]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 12:40:01 censornet /USR/SBIN/CRON[19290]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 12:40:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:40:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:45:01 censornet /USR/SBIN/CRON[31357]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 12:45:01 censornet /USR/SBIN/CRON[31358]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 12:45:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:45:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:50:01 censornet /USR/SBIN/CRON[12664]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 12:50:01 censornet /USR/SBIN/CRON[12666]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 12:50:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:50:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:53:01 censornet /USR/SBIN/CRON[20424]: (root) CMD (/usr/local/sbin/process_denied_logs.pl /var/log/dansguardian/acc$
    Oct 10 12:55:01 censornet /USR/SBIN/CRON[24408]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 12:55:01 censornet /USR/SBIN/CRON[24411]: (root) CMD (/usr/local/sbin/process_web_logs.pl /usr/local/squid/logs/access$
    Oct 10 12:55:01 censornet /USR/SBIN/CRON[24413]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 12:55:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 12:55:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:00:01 censornet /USR/SBIN/CRON[32216]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 13:00:01 censornet /USR/SBIN/CRON[32217]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:00:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:00:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:05:01 censornet /USR/SBIN/CRON[10710]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:05:01 censornet /USR/SBIN/CRON[10714]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 13:05:01 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:05:01 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:08:01 censornet /USR/SBIN/CRON[12563]: (root) CMD (/usr/local/sbin/process_denied_logs.pl /var/log/dansguardian/acc$
    Oct 10 13:10:01 censornet /USR/SBIN/CRON[12964]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:10:01 censornet /USR/SBIN/CRON[12968]: (root) CMD (/usr/local/sbin/process_web_logs.pl /usr/local/squid/logs/access$
    Oct 10 13:10:01 censornet /USR/SBIN/CRON[12970]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 13:10:01 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:10:01 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:15:01 censornet /USR/SBIN/CRON[14975]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 13:15:01 censornet /USR/SBIN/CRON[14976]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:15:03 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:15:03 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:20:01 censornet /USR/SBIN/CRON[21559]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:20:01 censornet /USR/SBIN/CRON[21562]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 13:20:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:20:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:22:55 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:22:55 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:23:01 censornet /USR/SBIN/CRON[28598]: (root) CMD (/usr/local/sbin/process_denied_logs.pl /var/log/dansguardian/acc$
    Oct 10 13:23:02 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:23:02 censornet kernel: br0: topology change detected, propgatingOct 10 13:23:24 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:23:24 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:23:29 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:23:29 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:23:33 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:23:33 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:23:50 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:23:50 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:24:08 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:24:08 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:24:20 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:24:20 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:24:28 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:24:28 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:24:37 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:24:37 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:25:01 censornet /USR/SBIN/CRON[1169]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:25:01 censornet /USR/SBIN/CRON[1171]: (root) CMD (/usr/local/sbin/process_web_logs.pl /usr/local/squid/logs/access.$
    Oct 10 13:25:02 censornet /USR/SBIN/CRON[1189]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/Oct 10 13:25:03 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:25:03 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:25:21 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:25:21 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:25:28 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:25:28 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:25:42 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:25:42 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:26:22 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:26:22 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:27:35 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:27:35 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:27:36 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:27:36 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:28:09 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:28:09 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:29:51 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:29:51 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:29:52 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:29:52 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:30:01 censornet /USR/SBIN/CRON[9802]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/mr$
    Oct 10 13:30:01 censornet /USR/SBIN/CRON[9803]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:30:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:30:04 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:30:12 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:30:12 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:31:54 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:31:54 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:33:00 censornet kernel: br0: received tcn bpdu on port 1(eth0)
    Oct 10 13:33:00 censornet kernel: br0: topology change detected, propgating
    Oct 10 13:33:57 censornet su_exec[19781]: connect from localhost
    Oct 10 13:34:00 censornet dansguardian: Error connecting to proxy
    Oct 10 13:34:00 censornet last message repeated 8 times
    Oct 10 13:35:01 censornet /USR/SBIN/CRON[22544]: (root) CMD (/usr/local/sbin/update_access_rules >/dev/null 2>/dev/null)
    Oct 10 13:35:01 censornet /USR/SBIN/CRON[22548]: (root) CMD (if [ -x /usr/bin/mrtg ] && [ -r /etc/mrtg.cfg ]; then /usr/bin/m$
    Oct 10 13:35:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:35:02 censornet ucd-snmp[438]: Connection from 127.0.0.1
    Oct 10 13:38:01 censornet /USR/SBIN/CRON[31383]: (root) CMD (/usr/local/sbin/process_denied_logs.pl /var/log/dansguardian/acc$
    This pattern is pretty much repeated over and over.

    Sorry to post long log but I wanted to show an hour of logging.

    Any help is greatfully received!

  7. #7
    Alis_Klar's Avatar
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    Solution

    Hi,

    Just spotted this and thought it would be polite to let ppl know how this was fixed. .....Well not fixed as such.

    This Censornet points to our LA's proxy filter. We added the censornet to add some local granularity for us locally.

    The LA were using an iMimic platform. When they switched over to Squidcache and Webwasher the problem disappeared!!!



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