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Broadband connection

>50% packet loss and a bad experience overall

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gerhardlazu
3: Seeker

I am on Gigafast 900, and as of 30th March 2021 I started getting frequent "No internet" errors when browsing and video conferences stalling. It's getting to the point that I can't browse or work for 10 minutes without going offline apparently. How does a 900Mbps connection help if I can't use it reliably for 10 minutes?

 

mtr is showing >50% package loss and latency that ranges from 4ms to 160ms:

Host                              Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. unifi.localdomain               0.0%   601    0.2   0.1   0.1   0.2   0.0
 2. 192.168.101.1                  23.5%   600    0.7   0.6   0.3   1.2   0.1
 3. 90.247.64.1                    10.7%   600    3.4   3.7   2.8   7.3   0.3
 4. 63.130.104.194                 54.2%   600    4.1   4.1   2.9   7.9   0.4
 5. 90.255.251.93                  34.4%   600    4.9   6.0   3.9 157.2   9.7
 6. 108.170.246.161                26.2%   600    6.3   6.4   4.9  73.4   3.6
 7. 216.239.57.121                 65.8%   600    5.4   5.2   4.5   6.5   0.3
 8. lhr25s02-in-f99.1e100.net      18.8%   600    5.4   5.1   4.0   9.4   0.4

Notice that there is 0% packet loss from my host to the router, unifi.localdomain above. This connection is 10Gbit wired, with sub millisecond latencies; 0.1ms - 0.2ms.

 

The router connects via a wired Cat6A to the Vodafone modem, 192.168.101.1 above. That is showing 23.5% packet loss and up to 1.2ms latency. Not great, but it's always been like this, so let's move on.

 

Skipping to 63.130.104.194, this is inside the Vodafone network and is losing more than 50% of all packets!

 

90.255.251.93 is also inside the Vodafone network and is losing 34% of all packets, but has latencies ranging from 3.9ms to 157ms!

 

Vodafone, can you fix this problem inside your network please?

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1 ACCEPTED SOLUTION

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KeithAlger
16: Advanced member

Vodafone doesn't supply a Gigafast Modem.  They have their own modem/router which when used with Gigafast just works as a ROUTER!  Hence welcome to the wonderful world of DOUBLE NAT and related packet loss!

 

The simple answer is to connect your Unifi router directly to the ONT or (G)PON and sign in using PPPoE and the username (ends in @ broadand.vodafone.co.uk) and password that you can obtain by asking Vodafone.  If you have an ONT then you'll also need to find a way to express VLAN ID 911 on the WAN port of your Unifi device, if you have a PON/GPON then you probably won't need the VLAN ID.

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KeithAlger
16: Advanced member

Vodafone doesn't supply a Gigafast Modem.  They have their own modem/router which when used with Gigafast just works as a ROUTER!  Hence welcome to the wonderful world of DOUBLE NAT and related packet loss!

 

The simple answer is to connect your Unifi router directly to the ONT or (G)PON and sign in using PPPoE and the username (ends in @ broadand.vodafone.co.uk) and password that you can obtain by asking Vodafone.  If you have an ONT then you'll also need to find a way to express VLAN ID 911 on the WAN port of your Unifi device, if you have a PON/GPON then you probably won't need the VLAN ID.

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gerhardlazu
3: Seeker

Vodafone doesn't supply a Gigafast Modem

 

You're right, I'm just using the standard modem/router as such. The double NAT explains the packet loss on the Vodafone device.

 

> The simple answer is to connect your Unifi router directly to the ONT or (G)PON and sign in using PPPoE and the username (ends in @ broadand.vodafone.co.uk) and password that you can obtain by asking Vodafone.

 

I didn't know that I can connect the Unifi router directly into the OLT (Calix 801Gv2 in my case). I will reach out to Vodafone about this, and remove an extra component in the networking stack. Thanks!

 

While this would solve the 25% packet loss on the modem/router, it's Vodafone's internal network that I'm having most trouble with. 90.255.251.93 is pretty bad. This is what I'm getting right now for Google's DNS 8.8.8.8, which is typically a quiet period of the day:

mtr -rwzbc100 8.8.8.8
Start: 2021-04-03T00:04:20+0100 HOST: Loss% Snt Last Avg Best Wrst StDev 1. AS??? unifi.localdomain (192.168.1.1) 0.0% 100 0.2 0.1 0.1 0.2 0.0 2. AS??? 192.168.101.1 3.0% 100 0.8 0.7 0.4 1.1 0.1 3. AS5378 90.247.64.1 2.0% 100 3.7 3.8 3.2 4.3 0.2 4. AS4445 63.130.104.194 34.0% 100 4.2 4.2 3.5 4.7 0.2 5. AS5378 90.255.251.93 46.0% 100 5.7 6.9 4.4 103.4 13.4 6. AS15169 108.170.246.129 5.0% 100 5.2 5.3 4.6 5.9 0.2 7. AS15169 216.239.58.221 62.0% 100 6.5 6.1 5.2 6.6 0.3 8. AS15169 dns.google (8.8.8.8) 21.0% 100 6.0 5.7 5.0 6.6 0.3

 

 

Cloudflare DNS is somewhat better:

 

mtr -rwzbc100 1.1.1.1
Start: 2021-04-03T00:06:18+0100
HOST:                                                   Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. AS???    unifi.localdomain (192.168.1.1)            0.0%   100    0.1   0.1   0.1   0.2   0.0
  2. AS???    192.168.101.1                              1.0%   100    0.7   0.7   0.4   1.1   0.1
  3. AS5378   90.247.64.1                                1.0%   100    3.8   3.8   3.2   4.3   0.2
  4. AS4445   63.130.105.110                            15.0%   100    9.9   9.7   9.2  10.3   0.2
  5. AS???    ixmanchester.as13335.net (195.66.244.71)  37.0%   100   17.1  18.9  16.1  41.2   4.6
  6. AS13335  162.158.32.11                              6.0%   100   16.7  17.7  16.1  46.3   4.2
  7. AS13335  one.one.one.one (1.1.1.1)                 22.0%   100    9.8   9.8   9.1  10.6   0.2

 

 

fastly.com is OK:

 

mtr -rwzbc100 fastly.com
Start: 2021-04-02T23:57:52+0100 HOST: Loss% Snt Last Avg Best Wrst StDev 1. AS??? unifi.localdomain (192.168.1.1) 0.0% 100 0.1 0.1 0.1 0.2 0.0 2. AS??? 192.168.101.1 2.0% 100 0.8 0.7 0.4 1.0 0.1 3. AS5378 90.247.64.1 6.0% 100 4.0 3.8 2.9 4.4 0.3 4. AS4445 63.130.105.130 5.0% 100 5.6 4.9 4.2 5.6 0.3 5. AS5378 90.255.251.105 14.0% 100 5.2 4.8 3.6 5.6 0.3 6. AS54113 151.101.193.162 20.0% 100 5.0 4.8 4.1 5.3 0.2

And bbc.co.uk is best:

 

 

mtr -rwzbc100 bbc.co.uk
Start: 2021-04-02T23:59:55+0100
HOST:                                          Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. AS???    unifi.localdomain (192.168.1.1)   0.0%   100    0.1   0.1   0.1   0.2   0.0
  2. AS???    192.168.101.1                     1.0%   100    0.8   0.7   0.4   1.0   0.1
  3. AS5378   90.247.64.1                       1.0%   100    3.6   3.7   3.1   4.3   0.3
  4. AS4445   63.130.105.130                   12.0%   100    5.0   4.9   3.9  10.4   0.7
  5. AS5378   90.255.251.105                    4.0%   100    5.1   4.8   4.2   5.4   0.2
  6. AS54113  151.101.192.81                    4.0%   100    4.7   4.8   3.2   5.5   0.3

 

 

So only certain hops are affected, specifically 63.130.104.194 & 90.255.251.93. I'm not sure how this varies through the day, but when I set this to run continuously, I will have a graph and better timings to work with. Don't think it will make a difference though if Vodafone won't act on this information.

 

Speed is not the issue. I'm getting 909Mbps down & 928Mbps up with a 5ms latency to Clouvider Limited.


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KeithAlger
16: Advanced member

Apart from the occasions when things go very wrong with VF or for those on Superfast with OpenReach, you generally don't get much packet loss with VF.

 

The problem would probably be exasperated if rather than a Unifi router, you are actually using a Hardware Firewall.  If that's the case then, the stripping of the origin addresses and identifiers by the VF router means that returning packets are more likely than ever to be rejected by the Hardware Firewall - it's almost a perfect storm!  I'm pretty sure that if you can pull up the logs for the WAN port on your Unifi, you'll see that the issue lies in it rejecting packets that the VF router is sending it!

 

Looking on the bright side, at least it's not Microtik and pfsense!

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gerhardlazu
3: Seeker

Thanks Keith for the answer, that absolutely did the trick for me.

 

Having removed the Vodafone-supplied router from the network and connected the Unifi router directly into the Calix 801Gv2 (OLT) packet loss is now 0%:

 

 

 Host                      Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. unifi.localdomain       0.0%  1356    0.2   0.1   0.1   1.0   0.1
 2. 84.65.192.1             0.0%  1356    8.0   8.5   7.0  56.7   4.7
 3. 63.130.105.110          0.0%  1355   11.7  11.8  10.4  61.5   4.9
 4. 90.255.251.117          0.0%  1355   20.9  21.0  19.5  73.3   4.9
 5. 151.101.192.81          0.0%  1355   11.4  11.5  10.1  62.2   4.6

 

 

The VLAN ID is essential for the Unifi router to work properly. I am sharing what worked for me on a UDMPro in case it helps others:

 

Screenshot 2021-04-27 at 10.09.12.png

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KeithAlger
16: Advanced member

It's one of those odd things.  Some people can double NAT and never have an issue, and then for some of us, it breaks the connection ability of almost everything on the local network.

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