I'm have a problem that is proving problematic to diagnose...
Since Sunday (9 Dec 2012), my Slingshot ADSL keeps dropping. It happens every 10-120 minutes, sometimes one after the other for an extended period. It usually takes several seconds to several minutes to reconnect again, and occasionally it can't reconnect and just keeps trying. When the ADSL drops, the ADSL light on my modem goes out and blinks while it's synching again.
Slingshot tech support initially said it was likely a problem with my ADSL modem (TP Link TD-W8960N v3 with the latest firmware [1.4.0 Build 111108 Rel.40398n]).
Here are the steps I've taken so far:
- TP Link router factory reset
- Disabled all modulations except for G.Dmt
- Got another modem from my neighbor and tried that
- Isolation test: plugged the modem directly into the master jack (no filter, no other jacks, no connections/splices before the jack - the line in from the street terminates at this jack)
- The Chorus tech (earlier today):
- Replaced the master jack (it was an old jack with the extra capacitor in it)
- Changed my "profile" from standard to robust.
The profile change meant my downstream line rate dropped from ~14000 odd ~10000 (which i expected), but ultimately had no effect on my disconnections. After all of the above, I still get disconnected...
The SNR and attenuation seem ok.
Here's the system log from my ADSL modem for the last hour or so before posting. It includes a router reboot, thus the initial activity and incorrect date/time:
Date/Time Facility Severity Message
Jan 1 00:00:06 syslog emerg BCM96345 started: BusyBox v1.00 (2011.04.10-10:17+0000)
Jan 1 00:00:06 user warn kernel: Serial flash device: name S25FL032A, id 0x0115, size 4096KB
Jan 1 00:00:06 user warn kernel: 96358VW2 prom init
Jan 1 00:00:06 user warn kernel: CPU revision is: 0002a010
Jan 1 00:00:06 user warn kernel: Determined physical RAM map:
Jan 1 00:00:06 user warn kernel: memory: 01fa0000 @ 00000000 (usable)
Jan 1 00:00:06 user warn kernel: Built 1 zonelists. Total pages: 8033
Jan 1 00:00:06 user warn kernel: brcm mips: enabling icache and dcache...
Jan 1 00:00:06 user warn kernel: Primary instruction cache 32kB, physically tagged, 2-way, linesize 16 bytes.
Jan 1 00:00:06 user warn kernel: Primary data cache 16kB, 2-way, linesize 16 bytes.
Jan 1 00:00:06 user warn kernel: PID hash table entries: 128 (order: 7, 512 bytes)
Jan 1 00:00:06 user warn kernel: Using 150.000 MHz high precision timer.
Jan 1 00:00:06 user warn kernel: Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Jan 1 00:00:06 user warn kernel: Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Jan 1 00:00:06 user warn kernel: KLOB Pool 1 Initialized: 1048576 bytes <0x80300000 ... 0x80400000>
Jan 1 00:00:06 user warn kernel: Mount-cache hash table entries: 512
Jan 1 00:00:06 user warn kernel: Total Flash size: 4096K with 64 sectors
Jan 1 00:00:06 user warn kernel: File system address: 0xbfc10100
Jan 1 00:00:06 user warn kernel: registering PCI controller with io_map_base unset
Jan 1 00:00:06 user warn kernel: BLOG v1.0 Initialized
Jan 1 00:00:06 user warn kernel: IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
Jan 1 00:00:06 user warn kernel: TCP established hash table entries: 1024 (order: 1, 8192 bytes)
Jan 1 00:00:06 user warn kernel: TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
Jan 1 00:00:06 user warn kernel: squashfs: LZMA suppport for slax.org by jro
Jan 1 00:00:06 user warn kernel: bcm963xx_mtd driver v1.0
Jan 1 00:00:06 user warn kernel: brcmboard: brcm_board_init entry
Jan 1 00:00:06 user warn kernel: SES: Button Interrupt 0x3 is enabled
Jan 1 00:00:06 user warn kernel: SES: LED GPIO 0x4 is enabled
Jan 1 00:00:06 user warn kernel: irq.c: reset_fac_irq is set to low_trigger.
Jan 1 00:00:06 user warn kernel: bcmxtmrt: Broadcom BCM6358A1 ATM Network Device v0.1 Apr 10 2011 18:09:46
Jan 1 00:00:06 user warn kernel: Mirror/redirect action on
Jan 1 00:00:06 user warn kernel: u32 classifier
Jan 1 00:00:06 user warn kernel: Actions configured
Jan 1 00:00:06 user warn kernel: VFS: Mounted root (squashfs filesystem) readonly.
Jan 1 00:00:06 user warn kernel: pktflow: module license 'Proprietary' taints kernel.
Jan 1 00:00:06 user warn kernel: Broadcom Packet Flow Cache learning via BLOG enabled.
Jan 1 00:00:06 user warn kernel: Created Proc FS /procfs/fcache
Jan 1 00:00:06 user warn kernel: Constructed Broadcom Packet Flow Cache v0.1 Feb 26 2009 14:21:08
Jan 1 00:00:06 user warn kernel: bcmxtmcfg: bcmxtmcfg_init entry
Jan 1 00:00:06 user warn kernel: adsl: adsl_init entry
Jan 1 00:00:06 user warn kernel: Broadcom BCM6358A1 Ethernet Network Device v0.3 Apr 10 2011 18:09:31
Jan 1 00:00:06 user warn kernel: Config Ethernet Switch Through MDIO Pseudo PHY Interface
Jan 1 00:00:06 user warn kernel: ethsw: found bcm5325e!
Jan 1 00:00:06 user warn kernel: dgasp: kerSysRegisterDyingGaspHandler: eth0 registered
Jan 1 00:00:06 user warn kernel: rate ctrl page 0x35, addr 0x02: 0
Jan 1 00:00:06 user warn kernel: 8021x_1 page 0x0A, addr 0x4C: 0
Jan 1 00:00:06 user warn kernel: 8021x_2 page 0x0A, addr 0x4E: 0
Jan 1 00:00:06 user warn kernel: eth0: MAC Address: 90:F6:52:A4:67:3C
Jan 1 00:00:06 user crit kernel: eth0 Link UP.
Jan 1 00:00:06 user warn kernel: PCI: Enabling device 0000:00:01.0 (0000 -> 0002)
Jan 1 00:00:06 user warn kernel: wl0: Broadcom BCM4351 802.11 Wireless Controller 5.10.85.0.cpe4.402.0
Jan 1 00:00:06 user warn kernel: dgasp: kerSysRegisterDyingGaspHandler: wl0 registered
Jan 1 00:00:07 user warn kernel: KLOB extended to 2 pools
Jan 1 00:00:07 user warn kernel: BcmAdsl_Initialize=0xC006B1F8, g_pFnNotifyCallback=0xC0088744
Jan 1 00:00:07 user warn kernel: AnnexCParam=0x00000000 AnnexAParam=0x00000980 adsl2=0x00000000
Jan 1 00:00:07 user warn kernel: pSdramPHY=0xA1FFFFF8, 0x1B777C 0xDEADBEEF
Jan 1 00:00:08 user warn kernel: AdslCoreSharedMemInit: shareMemAvailable=21712
Jan 1 00:00:08 user warn kernel: AdslCoreHwReset: AdslOemDataAddr = 0xA1FEF96C
Jan 1 00:00:08 user warn kernel: AnnexCParam=0x00000000 AnnexAParam=0x00000980 adsl2=0x00000000
Jan 1 00:00:08 user warn kernel: dgasp: kerSysRegisterDyingGaspHandler: dsl0 registered
Jan 1 00:00:08 user warn kernel: KLOB extended to 3 pools
Jan 1 00:00:08 user warn kernel: KLOB extended to 4 pools
Jan 1 00:00:08 user warn kernel: KLOB extended to 5 pools
Jan 1 00:00:08 user warn kernel: KLOB extended to 6 pools
Jan 1 00:00:08 user warn kernel: KLOB extended to 7 pools
Jan 1 00:00:08 user warn kernel: KLOB extended to 8 pools
Jan 1 00:00:10 user warn kernel: Scratch pad is not initialized.
Jan 1 00:00:10 user crit kernel: xDSL G.994 training
Jan 1 00:00:16 user crit kernel: ADSL G.992 started
Jan 1 00:00:17 user crit kernel: ADSL link down
Jan 1 00:00:17 user warn kernel: TP: ADSL LINK DOWN.
Jan 1 00:00:24 user crit kernel: xDSL G.994 training
Jan 1 00:00:30 user crit kernel: ADSL G.992 started
Jan 1 00:00:35 user crit kernel: ADSL G.992 channel analysis
Jan 1 00:00:43 user crit kernel: ADSL link down
Jan 1 00:00:43 user warn kernel: TP: ADSL LINK DOWN.
Jan 1 00:00:46 user crit kernel: xDSL G.994 training
Jan 1 00:00:52 user crit kernel: ADSL G.992 started
Jan 1 00:00:57 user crit kernel: ADSL G.992 channel analysis
Jan 1 00:01:05 user crit kernel: ADSL link down
Jan 1 00:01:05 user warn kernel: TP: ADSL LINK DOWN.
Jan 1 00:01:12 user crit kernel: xDSL G.994 training
Jan 1 00:01:18 user crit kernel: ADSL G.992 started
Jan 1 00:01:23 user crit kernel: ADSL G.992 channel analysis
Jan 1 00:01:31 user crit kernel: ADSL G.992 message exchange
Jan 1 00:01:32 user crit kernel: ADSL link up, Path 0, us=632, ds=10647
Jan 1 00:01:35 daemon crit syslog: PPP LCP UP.
Jan 1 00:01:35 daemon crit syslog: Received valid IP address from server. Connection UP.
Jan 1 00:01:35 user warn kernel: ip_tables: (C) 2000-2006 Netfilter Core Team
Jan 1 00:01:36 user warn kernel: Netfilter messages via NETLINK v0.30.
Jan 1 00:01:36 user warn kernel: nf_conntrack version 0.5.0 (253 buckets, 2024 max)
Dec 11 16:53:01 user warn dnsprobe[790]: dns query failed
Dec 11 16:53:06 user warn dnsprobe[790]: dns query failed
Dec 11 16:53:11 user warn dnsprobe[790]: dns query failed
Dec 11 16:57:19 user warn dnsprobe[790]: dns query failed
Dec 11 16:57:23 user crit kernel: ADSL link down
Dec 11 16:57:23 user warn kernel: TP: ADSL LINK DOWN.
Dec 11 16:57:24 user warn dnsprobe[790]: dns query failed
Dec 11 16:57:25 user crit kernel: xDSL G.994 training
Dec 11 16:57:26 daemon crit syslog: Clear IP addresses. Connection DOWN.
Dec 11 16:57:26 daemon crit syslog: Clear IP addresses. PPP connection DOWN.
Dec 11 16:57:29 user warn dnsprobe[790]: dns query failed
Dec 11 16:57:31 user crit kernel: ADSL G.992 started
Dec 11 16:57:36 user crit kernel: ADSL G.992 channel analysis
Dec 11 16:57:44 user crit kernel: ADSL G.992 message exchange
Dec 11 16:57:45 user crit kernel: ADSL link up, Path 0, us=504, ds=9795
Dec 11 16:57:54 daemon crit syslog: PPP LCP UP.
Dec 11 16:57:54 daemon crit syslog: Received valid IP address from server. Connection UP.
Dec 11 17:09:17 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=46.72.48.242 DST=119.xxx.xxx.xxx LEN=48 TOS=0x00 PREC=0x00 TTL=106 ID=25637 PROTO=TCP SPT=38052 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:14:57 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=93.179.203.114 DST=119.xxx.xxx.xxx LEN=60 TOS=0x00 PREC=0x00 TTL=47 ID=9750 DF PROTO=TCP SPT=59548 DPT=80 WINDOW=5840 RES=0x00 SYN URGP=0
Dec 11 17:27:19 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=61.164.116.80 DST=119.xxx.xxx.xxx LEN=40 TOS=0x00 PREC=0x00 TTL=103 ID=256 PROTO=TCP SPT=6000 DPT=3389 WINDOW=16384 RES=0x00 SYN URGP=0
Dec 11 17:29:52 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=41.228.41.135 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=103 ID=20517 DF PROTO=TCP SPT=34470 DPT=18669 WINDOW=8192 RES=0x00 SYN URGP=0
Dec 11 17:29:53 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=41.228.41.135 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=103 ID=20598 DF PROTO=TCP SPT=48335 DPT=18669 WINDOW=8192 RES=0x00 SYN URGP=0
Dec 11 17:29:54 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=41.228.41.135 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=103 ID=20679 DF PROTO=TCP SPT=50101 DPT=80 WINDOW=8192 RES=0x00 SYN URGP=0
Dec 11 17:29:54 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=41.228.41.135 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=104 ID=20678 DF PROTO=TCP SPT=58248 DPT=443 WINDOW=8192 RES=0x00 SYN URGP=0
Dec 11 17:41:45 user crit kernel: ADSL link down
Dec 11 17:41:45 user warn kernel: TP: ADSL LINK DOWN.
Dec 11 17:41:47 daemon crit syslog: Clear IP addresses. Connection DOWN.
Dec 11 17:41:47 daemon crit syslog: Clear IP addresses. PPP connection DOWN.
Dec 11 17:42:11 user crit kernel: xDSL G.994 training
Dec 11 17:42:18 user crit kernel: ADSL G.992 started
Dec 11 17:42:23 user crit kernel: ADSL G.992 channel analysis
Dec 11 17:42:31 user crit kernel: ADSL G.992 message exchange
Dec 11 17:42:31 user crit kernel: ADSL link up, Path 0, us=504, ds=9383
Dec 11 17:42:40 daemon crit syslog: PPP LCP UP.
Dec 11 17:42:40 daemon crit syslog: Received valid IP address from server. Connection UP.
Dec 11 17:42:46 user warn dnsprobe[2072]: dns query failed
Dec 11 17:42:51 user warn dnsprobe[2072]: dns query failed
Dec 11 17:44:28 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=11395 DF PROTO=TCP SPT=13280 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:44:31 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=12241 DF PROTO=TCP SPT=13280 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:44:37 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=13980 DF PROTO=TCP SPT=13280 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:46:16 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=43148 DF PROTO=TCP SPT=13880 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:46:19 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=44072 DF PROTO=TCP SPT=13880 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:47:36 user crit kernel: ADSL link down
Dec 11 17:47:36 user warn kernel: TP: ADSL LINK DOWN.
Dec 11 17:47:37 daemon crit syslog: Clear IP addresses. Connection DOWN.
Dec 11 17:47:37 daemon crit syslog: Clear IP addresses. PPP connection DOWN.
Dec 11 17:47:59 user crit kernel: xDSL G.994 training
Dec 11 17:48:01 user warn dnsprobe[2072]: dns query failed
Dec 11 17:48:05 user crit kernel: ADSL G.992 started
Dec 11 17:48:06 user warn dnsprobe[2072]: dns query failed
Dec 11 17:48:11 user warn dnsprobe[2072]: dns query failed
Dec 11 17:48:11 user crit kernel: ADSL G.992 channel analysis
Dec 11 17:48:19 user crit kernel: ADSL G.992 message exchange
Dec 11 17:48:19 user crit kernel: ADSL link up, Path 0, us=440, ds=9011
Dec 11 17:48:28 daemon crit syslog: PPP LCP UP.
Dec 11 17:48:28 daemon crit syslog: Received valid IP address from server. Connection UP.
Dec 11 17:48:34 user warn dnsprobe[2485]: dns query failed
Dec 11 17:48:39 user warn dnsprobe[2485]: dns query failed
Dec 11 17:49:32 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=212.94.96.131 DST=119.xxx.xxx.xxx LEN=48 TOS=0x00 PREC=0x00 TTL=111 ID=31934 PROTO=TCP SPT=40985 DPT=8443 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:51:41 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=5875 DF PROTO=TCP SPT=15886 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:51:44 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=6652 DF PROTO=TCP SPT=15886 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Dec 11 17:51:50 user alert kernel: Intrusion -> IN=pppoa0 OUT= MAC= SRC=201.78.28.244 DST=119.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=107 ID=8411 DF PROTO=TCP SPT=15886 DPT=34026 WINDOW=65535 RES=0x00 SYN URGP=0
Any bright ideas about what could be causing this?
![]() ![]() |





Master Geek
Woah - sorry about the freaky post with all the extra HTML. I tried to be clever and paste the log details and stats, etc. It looked great in the preview!
Moderator: feel free to delete this entirely. I can repost it.





Master Geek
So Slingshot now tell me they have to turn interleaving back on (which takes 1-3 DAYS!!!) and if that doesn't help (I do believe it can improve stability...although I'm not sure how), MAYBE they need to get the Chorus guy back out?
Seriously. Surely they can be a bit more proactive?. The line from my house to the cabinet appears fine...and as it seems I have access to more knowledge than Slingshot do (thanks to Geekzone!), perhaps someone can suggest the next steps so that I can call Slingshot up and pass it on?





Uber Geek
Hi,
Interleaving is just error correction. It improves stability of the line by checking packets, but it increases latency.
Not sure if it would help your situation at all. If DSL stays down for a long time before re-connecting, its probably something else. Did the Chorus tech check anything else? You might want to look at a master splitter install.
I'd suggest getting the tech back, sounds like something else is going on. You've done pretty much everything you can do to elimiate your equipment with the spare modem. If the jack-point has been replaced and the profile has been tweaked and your connection still isn't stable, that suggests its still a physical fault somewhere.





Uber Geek


DravidDavid: Hi,
Interleaving is just error correction. It improves stability of the line by checking packets, but it increases latency.
Not sure if it would help your situation at all. If DSL stays down for a long time before re-connecting, its probably something else. Did the Chorus tech check anything else? You might want to look at a master splitter install.
I'd suggest getting the tech back, sounds like something else is going on. You've done pretty much everything you can do to elimiate your equipment with the spare modem. If the jack-point has been replaced and the profile has been tweaked and your connection still isn't stable, that suggests its still a physical fault somewhere.
Couldn't have said it better myself.
If you've isolated 2 modems into the master JP and are still having the issue, after all of that, you will need to relog a fault with out staff to get another chorus person out. For FD they cant really be sure if its fixed on the spot as some of your conenctions are up to 2 hours. They have to fix anything suspect, and then we re analyze. See if interleaving does anything but im doubting it, If we can see more than 10 disconnections a day, you have tested your equipment, out Tech staff can put it back to chorus no problem.
Cheers
Mike





Master Geek
Thanks for the input!
As it turned out, it was a faulty (corroded) connection that was often stable with the occasional dropout. The Chorus tech couldn't see any issues with the physical pair on his meter, but to his credit it decided to go eyeball all the connections back to the cabinet.
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