- Biosdevname
- Biosdevname uses devices name that reveal information about the physical location. e.g em123 (Ethernet Motherboard Portnumber)
-
/etc/network/interface. set it to use static ip, in the file end add the following , and followed by ifdown eth0 . ifup eth0
auto eth0
iface eth0 inet static
address 10.0.0.100
netmask 255.255.255.0
gateway 10.0.0.1
- /etc/resolv.conf save dns server which was given in bootup stage
- network tools, ping time to leave an round trip time
- dig , find dns relay issue.
root@ubuntu:/etc# dig google.com
; <<>> DiG 9.9.5-3ubuntu0.4-Ubuntu <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58828
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 5 IN A 216.58.201.46
;; Query time: 29 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Sun Apr 22 14:21:02 PDT 2018
;; MSG SIZE rcvd: 44
use namp to check which ports the host is open