Big Packet loss on router - Compal CH7466CE

[alexnastas1]

Hello, 

I'm sorry that it's in english. I moved to Germany one year ago and my German is not so good. 

I have big packet loss on the cable router. 

Everything is ok when I do a normal ping to the gateway (192.168.44.1)

However, when I send a fast-ping (ping 192.168.44.1 -i 0.1) (10 packets / second), after the packet 20 - i start having very big loss: 

147 packets transmitted, 21 packets received, 85.7% packet loss
round-trip min/avg/max/stddev = 2.345/4.507/11.967/2.175 ms

same with MTR: 

Alexs-MacBook-Pro-2.local (192.168.44.5)                                                                                                                        2018-10-30T10:45:45+0100
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                                                                                                                Packets               Pings
 Host                                                                                                                                         Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. compalhub.home                                                                                                                            99.5%   194    6.1   6.1   6.1   6.1   0.0
 2. ???
 3. ip5886dd1e.static.kabel-deutschland.de                                                                                                     0.0%   193   10.4  13.7   9.5 169.3  12.3
 4. ip5886c2cd.static.kabel-deutschland.de                                                                                                     0.0%   193   11.1  15.3  10.4 226.0  18.5
 5. ip5886edf8.static.kabel-deutschland.de                                                                                                     0.0%   193   16.1  19.0  15.8 150.7   9.8
 6. ip5886eda1.static.kabel-deutschland.de                                                                                                     0.0%   193   18.0  18.8  13.6 103.4  10.9
 7. 100ge7-2.core1.fra1.he.net                                                                                                                 0.0%   193   14.9  17.8  14.0 206.9  13.9
 8. 100ge1-1.core1.par2.he.net                                                                                                                 0.0%   193   30.5  41.0  23.0 221.5  27.5
 9. 100ge14-1.core1.nyc4.he.net                                                                                                                0.0%   193   96.8 100.6  93.9 312.9  25.7
10. 100ge16-1.core1.sjc2.he.net                                                                                                                1.6%   193  161.1 162.9 157.9 241.0   8.7
11. v1537.core3.fmt2.he.net                                                                                                                    2.1%   193  171.8 179.6 157.3 409.3  44.3

These tests have been done via wired ethernet connection (not Wifi). I have tried disabling the Firewalling function on the router and restarting it. Nothing changes. Whenever I start sending packet bursts - it starts choking and stops forwarding. 

Anyone has any idea ? 

Thanks in advance

Alex

[Jens]

Hello Alex,

what is, if you delete the query time?

Regards

Jens

[alexnastas1]

If I only ping with 1 packet per second, (i.e. the default ping delay) - then there is no packet loss. 

But you do understand that the most basic router should be capable of handling bursts of packets. And sending 10 packets/second - is nothing and this should not lead to the router starting to drop the packets after the 20th frame received. 

This is definitely not a normal behaviour over a 400 Mbps Internet Link. 

I work from home and am continuously using VPN tunnels, sending a lot of traffic back and forth and it's not ok for me to have packet drops at my first hop

Regards

Alex

[alexnastas1 · Accepted solution]

Ok ! 

So after some extensive testing I have found out that the link seems to be ok. 

It turns out that only bursts with the destination IP of the router itself, get dropped. This must be some kind of a DDoS protection of the router. 

If I actually try to ping google or some other public IP, then the results are ok. 

sudo ping google.com -i 0.01 -c 5000
64 bytes from 172.217.23.174: icmp_seq=0 ttl=54 time=17.116 ms
64 bytes from 172.217.23.174: icmp_seq=1 ttl=54 time=17.606 ms
64 bytes from 172.217.23.174: icmp_seq=2 ttl=54 time=15.737 ms
64 bytes from 172.217.23.174: icmp_seq=3 ttl=54 time=16.875 ms
....

--- google.com ping statistics ---
5000 packets transmitted, 4999 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 10.419/17.042/43.682/2.936 ms

Only 1 packet lost from 5000 packets, sent with a rate of 100 packet/second. Which is an acceptable loss  rate

Jens, 

Thanks for your help

The issue may be closed. 

Regards

Alex

[Jens]

Hello Alex,

sounds nice and thanks for your replay.

Now I'm closing up here.

Regards

Jens