Diagnosing network connections: Slow initial connection
Hi,
I want to identify why my ISP is sometimes slow, and wonder how and what tools to use. The problem is as follows: While the lines are very fast, I experience that at times of day where there are presumably high traffic, a new initial connection is very slow and unstable. For example getting response from DNS is slow. And after getting the answer, getting response from a web server is also slow. Or sometimes there is no response at all, and I have to retry. Running a speed test will show high data rates. So it is only initial connection that is slow/unstable. What is the explanation for these symptoms? Are there some tools and tests I can use to pinpoint the problem from home, without/before contacting the ISP? |
Code:
sudo ping -f -c 1000 ip_of_your_gateway if packets loss in second or third case then Code:
sudo traceroute address |
Interesting, flood pinging my own wireless router, connected with a wire:
# ping -f -c 1000 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. .................................................................................................... .................................................................................................... .................................................................................................... .................................................................................................... .................................................................................................... ........ --- 192.168.1.1 ping statistics --- 1000 packets transmitted, 492 received, 50% packet loss, time 8207ms rtt min/avg/max/mdev = 0.701/1.417/3.104/0.316 ms, ipg/ewma 8.215/0.921 ms This seems very wrong? |
Had another router lying around. Same cables, same location:
ping -f -c 1000 192.168.1.254 PING 192.168.1.254 (192.168.1.254) 56(84) bytes of data. --- 192.168.1.254 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 1026ms rtt min/avg/max/mdev = 0.941/0.980/2.092/0.102 ms, ipg/ewma 1.027/0.964 ms |
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