Question Problem after upgrade

DeanTH23

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Aug 17, 2019
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(I did a post about this before but i have new information and new questions, so i thought to create a new one to avoid confusion.I totally understand if the mods find this unacceptable and remove the post.)

  • So, after 1 year with a 50/5 Mbps connection, i decided to upgrade to 100/10 Mbps (download/upload).
  • Since then, I've been experiencing days with way lower speeds than expected, millions of CRC Errors, periods with so many disconnections that i basically didn't have a connection.
  • I contacted my ISP and they brought some technicians.They added a new cable from the street to my house and told me to bring an electrician and connect myself to that, either by replacing the current wiring or by creating a brand new outlet, isolated from the others in the house.
  • I brought an electrician here and did the second option for a lot of reasons.Since then, for about a week, my speed went to 110/10 solid, but i still had hundreds of thousands CRC Errors (FEC Errors almost 0).
  • The last 3 days, the speed suddenly dropped to 85-88 downstream (upstream is always 10 never changed through all this) and my errors are still thousands, but way less and no disconnections.My guess is that they reduced bandwidth in order to reduce the errors, but if it's true, i can't accept it.
  • It's worth to say that, the big CRC Error increase happens in the same periods every day, except the last 3 of course.( Usually from 17:00 to 21:00 or something close to that timeline).
  • In addition, the wireless performance is way worse.To make it clear, right now i'm typing this while using data and not wifi connection from my smartphone.And the router is literally next to me...It has some times of "good" connectivity and some times (mostly) of being totally unusable...Wifi Bars are maxed out in any device, speeds varies from 2Mbps download to 50, ping/jitter mostly stable and low.
As of right now, my ISP doesn't seem to want to do anything.I called them hundreds of times and they say to me the same things every time.I consider reporting them and go into a fight using the law, but it probably will take long aswell.
I also consider replacing that router+modem combo with a decent, highly reviewed model from Germany (AVM FritzBox 7530 or 7590) but i'm not sure if the router has anything to do with this.

What i'm asking for is advice, suggestions etc...Like is the router's fault?
Is the ISP's street copper wires fault?
What should be my next move?
I'm sorry for that essay but i need to include every detail (high chance that i forgot some, i hope not important ones).

Thank you.
 
Last edited:
First - you need to make some decent documentation that support your claim.
  • Have you only one device (PC)? Are there one or several devices that is affected by this issue?
  • Can you go to speedtest.net and do proper testing of the internet connection? Make screenshot (that is at least one piece of documentation).
  • Have you logged on the router (via web browser)? It should contain a log that can tell if there is a problem on the outside or not (that help you decide on spending money on new router or not).
Also, you should do test over time (also to support your claim of having a faulty connection)
  • Make the ping command running over time <how-to-do>. Nb be aware that this cannot rule out the problem being the site that you ping against, so to help against that (that will be the isp arguments against you) you need to run at least two such ping commands to two different sites/servers.
  • I also found this web page - seems to fit perfectly for the purpose testmy.net - I haven't tested this yet, but you can - and if you do please give some feedback if it work for you (remember to make screenshot for your case against the isp).
 

DeanTH23

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Aug 17, 2019
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First - you need to make some decent documentation that support your claim.
  • Have you only one device (PC)? Are there one or several devices that is affected by this issue?
  • Can you go to speedtest.net and do proper testing of the internet connection? Make screenshot (that is at least one piece of documentation).
  • Have you logged on the router (via web browser)? It should contain a log that can tell if there is a problem on the outside or not (that help you decide on spending money on new router or not).
Also, you should do test over time (also to support your claim of having a faulty connection)
  • Make the ping command running over time <how-to-do>. Nb be aware that this cannot rule out the problem being the site that you ping against, so to help against that (that will be the isp arguments against you) you need to run at least two such ping commands to two different sites/servers.
  • I also found this web page - seems to fit perfectly for the purpose testmy.net - I haven't tested this yet, but you can - and if you do please give some feedback if it work for you (remember to make screenshot for your case against the isp).
I have one PC connected directly to the router through LAN and 4-5 WLAN devices... Problems occur to every device, but of course the wireless connections are worse.
I'm using speedtest by Ookla, but every number you saw it's directly from the router logs.

The most common error i see in the logs is:
DNSv6 Error: The server replies non existent domain.

My issue is:
  1. Lower download speeds than expected.
  2. A lot of CRC Errors causing disconnections and in general, a terrible connection.
My ping through all that is always 6 or 7 ms.
If i'm with the LAN Device jitter is 0ms.
With WLAN Devices jitter could be from 0 to 200+.
 

DeanTH23

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Current modem and router: Make and models?

Run "ipconfig /all" (without quotes) via the Command Prompt.

Do so on the wired PC and one of the wireless devices.

Post the results.
I currently use my ISP's device.
It's a router+modem combo made from Sercomm and it's called "Speedport Plus".

I did what you said, but I don't know what to post here and what i should avoid posting (because it shows a lot of IP addresses).
I saved the results.Let me know about what you need.

Thank you.
 

DeanTH23

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Also, today i had the biggest CRC increase rate so far.

For about 20 minutes (+/- 5) i had 1.000 errors per second and then the router had a desync and a reset on it's own...After that ,things seem stable for now.
 
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I assume you are seeing the CRC errors in some display on the router. It is very different than CRC errors you see on the actual PC itself.

This sounds like a DSL connection since cable modems use a different name for errors other than CRC.

All this means is when the router gets the data it has been damaged. This is almost always related to some wiring issue. I would plug the router into the very first jack where the phone line comes into the house. This is purely to avoid the argument with the ISP that the problem is your house wires.

All you can do is keep bugging the ISP to fix this. Most times you offer to pay for it to be fixed. Almost no ISP charges you if they find the problem to be in their wires.
 

Ralston18

Titan
Moderator
The IP addresses you see (via IP config) are those IP addresses designated for "Private" network use.

Actually a misnomer because those IP addresses (actually three ranges/blocks of addresses are available) are used by thousands of small networks.

Reference:

https://www.lifewire.com/what-is-a-private-ip-address-2625970

(And you can easily find other similar links)

====

When I post my ipconfig results I redact my User Name, Host Name, Network Name, and part of the MAC.

For example ( "X's being my redactions):

PS C:\Users\XXXXXX> ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : ChXXXXXX
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : hsd1.md.comcast.net

Ethernet adapter MXXXX:

Connection-specific DNS Suffix . : hsd1.md.comcast.net
Description . . . . . . . . . . . : Realtek PCIe GbE Family Controller
Physical Address. . . . . . . . . : 8C-EC-4B-XX-XX-D4
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2601:147:c201:b20c:68cb:eb57:76c9:b455(Preferred)
Temporary IPv6 Address. . . . . . : 2601:147:c201:b20c:4562:83cb:f612:1647(Preferred)
Link-local IPv6 Address . . . . . : fe80::68cb:eb57:76c9:b455%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.107(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, March 3, 2021 6:39:26 AM
Lease Expires . . . . . . . . . . : Thursday, March 4, 2021 6:39:26 AM
Default Gateway . . . . . . . . . : fe80::9610:3eff:fe00:3495%12
192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 244116555
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-23-44-C6-16-8C-EC-4B-7E-7E-D4
DNS Servers . . . . . . . . . . . : 2601:147:c201:b20c:9610:3eff:fe00:3495
8.8.8.8
8.8.4.4
2601:147:c201:b20c:9610:3eff:fe00:3495
NetBIOS over Tcpip. . . . . . . . : Enabled
Connection-specific DNS Suffix Search List :
hsd1.md.comcast.net

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 74-40-BB-XX-XX-BE
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

====

Can you provide any additional information regarding the specifc modem/router?

https://www.sercomm.com/contpage.aspx?langid=1&type=prod2&L1id=2&L2id=2&L3id=33
 
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DeanTH23

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Aug 17, 2019
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The IP addresses you see (via IP config) are those IP addresses designated for "Private" network use.

Actually a misnomer because those IP addresses (actually three ranges/blocks of addresses are available) are used by thousands of small networks.

Reference:

https://www.lifewire.com/what-is-a-private-ip-address-2625970

(And you can easily find other similar links)

====

When I post my ipconfig results I redact my User Name, Host Name, Network Name, and part of the MAC.

For example ( "X's being my redactions):

PS C:\Users\XXXXXX> ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : ChXXXXXX
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : hsd1.md.comcast.net

Ethernet adapter MXXXX:

Connection-specific DNS Suffix . : hsd1.md.comcast.net
Description . . . . . . . . . . . : Realtek PCIe GbE Family Controller
Physical Address. . . . . . . . . : 8C-EC-4B-XX-XX-D4
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2601:147:c201:b20c:68cb:eb57:76c9:b455(Preferred)
Temporary IPv6 Address. . . . . . : 2601:147:c201:b20c:4562:83cb:f612:1647(Preferred)
Link-local IPv6 Address . . . . . : fe80::68cb:eb57:76c9:b455%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.107(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, March 3, 2021 6:39:26 AM
Lease Expires . . . . . . . . . . : Thursday, March 4, 2021 6:39:26 AM
Default Gateway . . . . . . . . . : fe80::9610:3eff:fe00:3495%12
192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 244116555
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-23-44-C6-16-8C-EC-4B-7E-7E-D4
DNS Servers . . . . . . . . . . . : 2601:147:c201:b20c:9610:3eff:fe00:3495
8.8.8.8
8.8.4.4
2601:147:c201:b20c:9610:3eff:fe00:3495
NetBIOS over Tcpip. . . . . . . . : Enabled
Connection-specific DNS Suffix Search List :
hsd1.md.comcast.net

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 74-40-BB-XX-XX-BE
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

====

Can you provide any additional information regarding the specifc modem/router?

https://www.sercomm.com/contpage.aspx?langid=1&type=prod2&L1id=2&L2id=2&L3id=33
Speedport Plus Specs:
  • DSL\Standard: ADSL, ADSL2, ADSL2+, VDSL, VDSL2
  • 1 DSL: RJ11
  • 4 LAN: RJ-45, 10/100/1000 auto MDI/MDIX
  • 1 USB: USB 1.0 / 1.1 / 2.0
  • WLAN Standard: IEEE 802.11b/g/n/ac
  • Frequency area: 2.400 - 2.4835 GHz (IEEE 802.11b/g/n), 5.180 - 5.700 GHz (IEEE 802.11a/n/ac)
  • Max. Clients: 253 (WLAN: 32)
  • Max. Range: around 30 m in buildings around 150 m in the open with indivisibility
  • Transmission rate Wireless: IEEE 802.11b: up to 11 Mbps, IEEE 802.11g: up to 54 Mbps
    IEEE 802.11a: up to 54 Mbps, IEEE 802.11n: up to 300 Mbps, IEEE 802.11ac: up to866 Mbps
  • Security: WPA/WPA2, WEP 64bit / 128 bit, MAC-Filter, NAT, Firewall
  • Certification: CE certification
ipconfig results

Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : home

Connection-specific DNS Suffix . : home
Description . . . . . . . . . . . : Realtek Gaming GbE Family Controller
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2a02:587:1907:7223:44f1:2fa0:ff9b:44bb(Preferred)
IPv6 Address. . . . . . . . . . . : 2a02:587:1929:9086:44f1:2fa0:ff9b:44bb(Preferred)
Temporary IPv6 Address. . . . . . : 2a02:587:1907:7223:cd3:cdb0:9a25:cd0c(Preferred)
Temporary IPv6 Address. . . . . . : 2a02:587:1907:7223:690b:eae0:d5cf:d3d0(Deprecated)
Temporary IPv6 Address. . . . . . : 2a02:587:1907:7223:bd23:2634:387b:76a0(Deprecated)
Temporary IPv6 Address. . . . . . : 2a02:587:1929:9086:cd3:cdb0:9a25:cd0c(Preferred)
Link-local IPv6 Address . . . . . : fe80::44f1:2fa0:ff9b:44bb%6(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.7(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, March 3, 2021 8:43:56 AM
Lease Expires . . . . . . . . . . : Wednesday, March 3, 2021 10:43:56 PM
Default Gateway . . . . . . . . . : fe80::1%6
192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 100981237
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-26-DD-BE-9A-04-D9-F5-D6-1F-40
DNS Servers . . . . . . . . . . . : fe80::1%6
192.168.1.1
192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
 

Ralston18

Titan
Moderator
Not noting anything immediately astray via your "ipconfig /all".

Try manually downloading the network adapter drivers via the manufacturer's website. Reinstall and reconfigure.,

If your ISP does not provide IPv6 then disable.

Router: Lease time is only 2 hours. Access the router's admin screens and change to at least 24 hours.

Try using Google as your DNS Servers (8.8.8.8 and 8.8.4.4)
 

DeanTH23

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Aug 17, 2019
133
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Update:

Yesterday i got and installed my new AVM FritzBox 7530 and since then no issues, perfect stability.
It's only a 24h sample but judging by the stability, error count etc. i'm pretty sure that the ISP's router was the main reason behind all of these issues.
For example, with the ISP's router i had 100.000+ errors in 24 hours, almost everytime.
Now with the 7530 i think it's less than 100.
Speeds are perfect, SNR is stable, insanely better 2.4GHz WLAN performance etc.

Thanks for your effort and i hope that's the end of it.
 
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