System information

Manual:Troubleshooting tools

4 packets transmitted, 4 received, 0% packet loss, time 2999ms

rtt min/avg/max/mdev = 0.780/0.948/1.232/0.174 ms

Press Ctrl-C to stop ping process.

From MikroTik:

[admin@MikroTik] > ping 10.255.255.4

10.255.255.4 64 byte ping: ttl=62 time=2 ms

10.255.255.4 64 byte ping: ttl=62 time=8 ms

10.255.255.4 64 byte ping: ttl=62 time=1 ms

10.255.255.4 64 byte ping: ttl=62 time=10 ms

4 packets transmitted, 4 packets received, 0% packet loss

round-trip min/avg/max = 1/5.2/10 ms

Press Ctrl-C to stop ping process.

Using the traceroute command

Traceroute displays the list of the routers that packet travels through to get to a remote host. The traceroute or

tracepath tool is available on practically all Unix-like operating systems and tracert on Microsoft Windows

operating systems.

Traceroute operation is based on TTL value and ICMP “Time Exceeded” massage. Remember that TTL value in IP

header is used to avoid routing loops. Each hop decrements TTL value by 1. If the TTL reaches zero, the packet is

discarded and ICMP Time Exceeded message is sent back to the sender when this occurs.

Initially by traceroute, the TTL value is set to 1 when next router finds a packet with TTL = 1 it sets TTL value to

zero, and responds with an ICMP "time exceeded" message to the source. This message lets the source know that the

packet traverses that particular router as a hop. Next time TTL value is incremented by 1 and so on. Typically, each

router in the path towards the destination decrements the TTL field by one unit TTL reaches zero.

Using this command you can see how packets travel through the network and where it may fail or slow down. Using

this information you can determine the computer, router, switch or other network device that possibly causing

network issues or failures.

From Personal computer:

Windows:

C:\>tracert 10.255.255.2

Tracing route to 10.255.255.2 over a maximum of 30 hops

1 <1 ms <1 ms <1 ms 10.13.13.1

2 1 ms 1 ms 1 ms 10.255.255.2

Trace complete.

Unix-like:

Traceroute and tracepath is similar, only tracepath does not not require superuser privileges.

andris@andris-desktop:~$ tracepath 10.255.255.6

1: andris-desktop.local (192.168.10.4) 0.123ms pmtu 1500

1: 192.168.10.1 (192.168.10.1) 0.542ms

1: 192.168.10.1 (192.168.10.1) 0.557ms

2: 192.168.1.2 (192.168.1.2) 1.213ms

3: no reply

4: 10.255.255.6 (10.255.255.6) 2.301ms reached