Ifconfig and IPtables Configuration

Question

Would someone explain this below output of ifconfig command. This PC is using USB IP4 Internet connection.

For example: why there is, inet6 addr: fe80::5a2c:80ff:fe13:9263/64 Scope:Link, assigned /

active on eth1, and why loopback is active.

Am trying to configure IPtables with minimum connections as possible and minimize the risk of intrusion.

I did not find an answer to this question.

With many updates and upgrades to Ubuntu since 12.04.

-------------------------------------------------------------------------------------/

eth0 Link encap:Ethernet HWaddr 00:1e:33:c6:64:94

      UP BROADCAST MULTICAST  MTU:1500  Metric:1

      RX packets:0 errors:0 dropped:0 overruns:0 frame:0

      TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1000 

      RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth1 Link encap:Ethernet HWaddr 58:2c:80:13:92:63

      inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0

      inet6 addr: fe80::5a2c:80ff:fe13:9263/64 Scope:Link

      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

      RX packets:5291 errors:0 dropped:0 overruns:0 frame:0

      TX packets:4188 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1000 

      RX bytes:4658548 (4.6 MB)  TX bytes:458475 (458.4 KB)

lo Link encap:Local Loopback

      inet addr:127.0.0.1  Mask:255.0.0.0

      inet6 addr: ::1/128 Scope:Host

      UP LOOPBACK RUNNING  MTU:65536  Metric:1

      RX packets:783 errors:0 dropped:0 overruns:0 frame:0

      TX packets:783 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:0 

      RX bytes:75702 (75.7 KB)  TX bytes:75702 (75.7 KB)

-------------------------------------------------------------------------------/

This commend return empty results: nmcli dev list iface eth0 | grep IP4

----------------------------------------------------------------------------/

This commend : nmcli dev list iface eth1 | grep IP4

returns,

IP4.ADDRESS1: ip = 192.168.1.100/24, gw = 192.168.1.1

IP4.DNS1: 192.168.1.1

IP4.DNS[2]: 8.8.8.8

------------------------------------------------------------------------------/

Uname -a: 3.13.0-35-generic #62-Ubuntu SMP Fri Aug 15 01:58:42 UTC 2014 x86_64 x86_64

x86_64 GNU/Linux

user3766585 user3766585 · Accepted Answer · 2014-09-04T15:11:34

In the folder /etc/network you have the interfaces file, in which you can configure your Ethernet configuration. With something like this:

#Configure Loopback
auto lo
iface lo inet loopback
#The primary network interfaces
auto eth0
iface eth0 intet static
address X.X.X.X
netmask 255.255.255.0
gateway X.X.X.255

I hope this can help

Ifconfig and IPtables Configuration

1 Answers