Have you ever had a network problem due to packet lost or some unknown issues in your routers ? How could you find out those issues may be caused by your routers or Internet Service Provider ?
The following instructions will guide you how to figure it out.
// 1. Download mtr
// 2. Execute the following command to check whether or not there is a packet lost problem in your network node.
sudo mtr -c 100 -r [target IP]
// 3. Then execute traceroute
traceroute [target IP]
You will know that the network node is shown in IP address or Domain Name.
If it is IP address, it probably could be the router; if it is the domain name, it might be your ISP`s network devices.
// 4 Download nmap
https://nmap.org/download.html
// 5. Dump router`s info and you can find out what your router is, so as to fix it.
nmap -A -T4 router IP
Ex:
EricWeis-MacBook-Air:~ EricWei$ nmap -A -T4 192.168.11.1
Starting Nmap 7.12 ( https://nmap.org ) at 2016-07-07 23:33 JST
Stats: 0:01:47 elapsed; 0 hosts completed (1 up), 1 undergoing Service Scan
Service scan Timing: About 80.00% done; ETC: 23:35 (0:00:27 remaining)
Nmap scan report for buffalo.setup (192.168.11.1)
Host is up (0.027s latency).
Not shown: 995 closed ports
PORT STATE SERVICE VERSION
53/tcp open domain (status request not implemented)
80/tcp open http Buffalo AirStation http config
| http-auth:
| HTTP/1.0 401 Unauthorized
|_ Basic realm=AirStation
|_http-title: UNAUTHORIZED
2601/tcp open zebra Quagga routing software
2602/tcp open zebra Quagga routing software
49152/tcp open upnp Intel UPnP reference SDK 1.2 (Linux 2.4.20; UPnP 1.0)
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port53-TCP:V=7.12%I=7%D=7/7%Time=577E6838%P=x86_64-apple-darwin13.4.0%r
SF:(DNSVersionBindReq,20,"\0\x1e\x02G\x81\x85\0\x01\0\0\0\0\0\0\x07version
SF:\x04bind\0\0\x10\0\x03")%r(DNSStatusRequest,E,"\0\x0c\x02H\x90\x84\0\0\
SF:0\0\0\0\0\0");
Service Info: OS: Linux; Device: WAP; CPE: cpe:/o:linux:linux_kernel:2.4.20
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 141.69 seconds
