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295 posts

Ultimate Geek
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Topic # 188956 11-Dec-2015 09:53
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Hey all

Just wanting some advise or areas to investigate, so I can test this problem further or maybe suggest to 2Deg some other areas.

Ive got a Draytek 120 bridged to a WRT54GL access point running tomato. Behind these are an assortment of laptops, mobile devices, Win2k8 server, VOIP adapters etc. The house is a new build (appro 7 years old).

For the last 3 days, around 7am, our ADSL effective speed has dropped from its normal 9 Mbps (we are a wee way form the cabinet) to .6 Mbps. The negotiated connection in the draytek is still rock solid and in its normal 10788943 (for eg) area. From all indications the connection is good to go ... but download speed is non existent.

No amount of rebooting Modems/Routers etc will restore the download speed.

On the 1st day it occurred 2Degree :
* Reset the port - no success
* Ran a 24 hr port monitoring.

The strange thing is that whilst Im chatting online with 2Deg support (approx 11am) ... the speed all of a sudden returns. No reboot, no dropping connection ... it all of a sudden is working 100% normal.

On looking through the various IP monitoring and Bandwidth monitoring on the Tomato router I notice there is very very steady incoming traffic around .6/.7 Mbps ... and not attributable to any IP address internally. Start to think DoS attack or some sort of flood. So enabled syslog server at this point.

Next day, same thing. Around 7am (only cause thats when I first started using the connection and having issues) its down to a crawl. This time on a call tro 2Deg and around 8:30 or so ... wham ... all of a sudden its full speed again. This time there is no associated incoming traffic which cant be explained. The 24 hr port monitoring wasnt complete so said I would get back to them the next day.

Now today. Same thing. Around 7am or so, speed down to .6 Mbps (this is measured by speedtest.net). On the call to 2Deg and at 8:30, mid call so no reboot, reset or anything .... speed returns.

The results of the 24 hour probe supposedly showed
* Some untwisted wires
* Some transmission errors
* 9 spontaneous resynchs which occurred at the same time as the line being maxed out
* some disconnection and bit swapping

The only large downloads done on the 10th (during the probe) would have been the WSUS Server downloading some updates for internal machines.

Ive configued the Drakteks DoS feature but nothing has come from that. The Tomato router does have port forwd in place, but nothing beyond the normal :
* 2Talk src addresses to destination ports internally
* FTP src addresses to destination port on FTP Server
* port 80 to my DEV web server
* port 25 for mail
* port 123 for NTP
* and some PPTP and L2TP ports.


Im not really skilled in analysing router log files but from a cursory glance there is a number of dropped packets (as would possibly be expected with a static IP), but nothing stands out.

It just seems so strange that it is so regular and the restoring of service doesnt involve any reboot etc. After some of the dramas we have had in the past month with Chorus disconnecting ports and us losing all services (they were connecting some other house for a telephone and we lost everything) I wouldnt be surprised if someone somewhere is playing with things and tey happen to start work around 7am!

Cheers

Craig

 

 

 

(PS.  Have also posted this to the Geekzone 2Deg forum, but thought maybe there would be more people here)

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5384 posts

Uber Geek
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  Reply # 1448583 11-Dec-2015 09:53
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Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

 



 

If you are posting regarding DSL speeds please check that

 



 

- you have reset your modem and router

 


 

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

 

- you are not being throttled by your ISP due to going over the monthly cap

 


 

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

 


 

- you read this topic and follow the instructions there.

 



 

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

 



 

- Your ISP and plan

 


 

- Type of connection (ADSL, ADSL2, VDSL)

 


 

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

 


 

- Your general location (or street)

 


 

- If you are rural or urban

 


 

- If you know your connection is to an exchange, cabinet or conklin

 


 

- If your connection is to a ULL or wholesale service

 


 

- If you have done an isolation test as per the link above

 



 

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

 



 

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

 



 

I recommend you read these two blog posts:

 



 

- Is your premises phone wiring impacting your broadband performance? (very technical)

 


 

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?




I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.



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Spark NZ

  Reply # 1448601 11-Dec-2015 10:08
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For a residential BB connection without proper security infrastructure in front of it, that's a scary list of ports exposed.

Cheers - N


 
 
 
 




295 posts

Ultimate Geek
+1 received by user: 7


  Reply # 1448604 11-Dec-2015 10:11
One person supports this post
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Talkiet: For a residential BB connection without proper security infrastructure in front of it, that's a scary list of ports exposed.

Cheers - N


Thanks

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