Traceroute gives 100% loss on first 4 hopes

RouterOS General
1

I have CRS connected to CCR router through fiber VLAN service provided telecom company. The other router is almost 1200kms (Remote area). Among service I run through the link is VOIP service and Intenet.

Today VOIP service has suddenly stopped working. It is hen I call I can hear them but they can not hear me. There is not NAT between and bandwidth is 100mbps tested by bandwidth test. used capacity is below 20Mbps. I ahve tried all means to make the service back includin restarting the routers.
The strange think is when I trace from the remote router I get the first hops 100% packet loss. I need help as to why I am getting this strange result.

/too traceroute 8.8.8.8

ADDRESS LOSS SENT LAST AVG BEST WORST STD-DEV STATUS

1 100% 2 timeout
2 100% 2 timeout
3 100% 2 timeout
4 100% 2 timeout
5 105.16.23.2 0% 2 34.5ms 34.2 33.9 34.5 0.3
6 105.16.12.137 0% 2 33.4ms 33.1 32.8 33.4 0.3
7 105.16.16.8 0% 2 32.2ms 32.2 32.2 32.2 0
8 72.14.212.38 0% 1 32.5ms 32.5 32.5 32.5 0
9 172.253.53.49 0% 1 33.1ms 33.1 33.1 33.1 0
10 100% 1 timeout
11 8.8.8.8 0% 1 31.9ms 31.9 31.9 31.9 0


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Mr. Mapunda
Net Solutions Limited
Tanzania

2

When you run traceroute, the sender sends out packets with low TTL. Starts off with TTL=1 and increases it by 1 whenever it receives an answer. And the answer is “ICMP expired” sent by a router if it sees packet with TTL equal to 0. TTL gets reduced by 1 by every router passed and the mechanizm is in place to help survive routing loops.
Normal TTL of outgoing packets depends on IP stack (OS), usually it’s at least 32 or 64.

Some routers in internet are configured not to send ICMP expired and those appear to have 100% packet loss. It can be either because these routers somehow malfunction or they don’t reply with ICMP expired. However, if you do get replies from next routers, then the routers with apparent 100% packet loss actually work.