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<h1>
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Check your current ip address
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</h1>
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<time class="published" datetime="2018-08-17T10:37:00+02:00">
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17 août 2018
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<li>Bash</li>
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<div class='article_content'>
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<h3>Check your current ip address</h3>
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<p>Run the command </p>
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<div class="highlight"><pre><span></span>ip addr show
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</pre></div>
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<p>and that will give you every information available</p>
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<div class="highlight"><pre><span></span>4: eth0: <> mtu 1500 group default qlen 1
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link/ether 5c:51:4f:41:7a:b1
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inet 169.254.33.33/16 brd 169.254.255.255 scope global dynamic
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valid_lft forever preferred_lft forever
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inet6 fe80::390a:f69e:1ba2:2121/64 scope global dynamic
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valid_lft forever preferred_lft forever
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3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 group default qlen 1
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link/ether 0a:00:27:00:00:03
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inet 192.168.56.1/24 brd 192.168.56.255 scope global dynamic
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valid_lft forever preferred_lft forever
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inet6 fe80::84cd:374e:843f:f82f/64 scope global dynamic
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valid_lft forever preferred_lft forever
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15: eth2: <> mtu 1500 group default qlen 1
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link/ether 00:ff:d2:8a:19:c3
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inet 169.254.40.62/16 brd 169.254.255.255 scope global dynamic
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valid_lft forever preferred_lft forever
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inet6 fe80::f199:2ca0:7aff:283e/64 scope global dynamic
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valid_lft forever preferred_lft forever
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1: lo: <LOOPBACK,UP> mtu 1500 group default qlen 1
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link/loopback 00:00:00:00:00:00
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inet 127.0.0.1/8 brd 127.255.255.255 scope global dynamic
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valid_lft forever preferred_lft forever
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inet6 ::1/128 scope global dynamic
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valid_lft forever preferred_lft forever
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5: wifi0: <BROADCAST,MULTICAST,UP> mtu 1500 group default qlen 1
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link/ieee802.11 5c:51:4f:41:7a:ad
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inet 192.168.1.1/24 brd 192.168.1.255 scope global dynamic
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valid_lft 42720sec preferred_lft 42720sec
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inet6 fe80::395f:3594:1dc2:57e3/64 scope global dynamic
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valid_lft forever preferred_lft forever
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21: wifi1: <> mtu 1500 group default qlen 1
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link/ieee802.11 5c:51:4f:41:7a:ae
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inet 169.254.12.77/16 brd 169.254.255.255 scope global dynamic
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valid_lft forever preferred_lft forever
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inet6 fe80::58d5:630:cbbd:c4d/64 scope global dynamic
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valid_lft forever preferred_lft forever
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12: eth3: <> mtu 1472 group default qlen 1
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link/ether 00:00:00:00:00:00:00:e0:00:00:00:00:00:00:00:00
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inet6 fe80::100:7f:fffe/64 scope global dynamic
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valid_lft forever preferred_lft forever
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10: eth4: <BROADCAST,MULTICAST,UP> mtu 1500 group default qlen 1
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link/ether 22:b7:57:52:5f:ff
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inet 192.168.42.106/24 brd 192.168.42.255 scope global dynamic
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valid_lft 6659sec preferred_lft 6659sec
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inet6 fe80::5110:eb6f:deb0:45c4/64 scope global dynamic
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valid_lft forever preferred_lft forever
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</pre></div>
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<p>You can select only one interface</p>
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<div class="highlight"><pre><span></span>ip addr show eth0
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</pre></div>
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<p>and only the relevant information will be displayed</p>
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<div class="highlight"><pre><span></span>4: eth0: <> mtu 1500 group default qlen 1
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link/ether 5c:51:4f:41:7a:b1
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inet 169.254.33.33/16 brd 169.254.255.255 scope global dynamic
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valid_lft forever preferred_lft forever
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inet6 fe80::390a:f69e:1ba2:2121/64 scope global dynamic
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valid_lft forever preferred_lft forever
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</pre></div>
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<h3>Check your current ip address the old way</h3>
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<p>The <code>ifconfig</code> command will return information regarding your network interfaces. Let's try it:</p>
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<div class="highlight"><pre><span></span>ifconfig
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</pre></div>
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<div class="highlight"><pre><span></span>eth1 Link encap:Ethernet HWaddr 0a:00:27:00:00:03
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inet adr:192.168.56.1 Bcast:192.168.56.255 Masque:255.255.255.0
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adr inet6: fe80::84cd:374e:843f:f82f/64 Scope:Global
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UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
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TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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collisions:0
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Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)
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eth4 Link encap:Ethernet HWaddr 22:b7:57:52:5f:ff
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inet adr:192.168.42.106 Bcast:192.168.42.255 Masque:255.255.255.0
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adr inet6: fe80::5110:eb6f:deb0:45c4/64 Scope:Global
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UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
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TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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collisions:0
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Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)
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lo Link encap:Boucle locale
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inet adr:127.0.0.1 Masque:255.0.0.0
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adr inet6: ::1/128 Scope:Global
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UP LOOPBACK RUNNING MTU:1500 Metric:1
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Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
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TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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collisions:0
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Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)
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wifi0 Link encap:UNSPEC HWaddr 5C-51-4F-41-7A-AD-00-00-00-00-00-00-00-00-00-00
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inet adr:192.168.1.1 Bcast:192.168.1.255 Masque:255.255.255.0
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adr inet6: fe80::395f:3594:1dc2:57e3/64 Scope:Global
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UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
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TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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collisions:0
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Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)
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</pre></div>
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<p>On the left column you have the list of network adapters. The <code>lo</code> is the local loopback, it is an interface that points to the localhost. Interfaces starting with <code>eth</code> refer to wired connections over ethernet (or sometimes USB in the case of a phone acting as an access point over USB). Interfaces starting with <code>wlan</code>or <code>wifi</code> refer to wireless connections.</p>
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<p>On the right column you have some information corresponding to the interface such as the IPv4, the IPv6, the mask, some statistics about the interface and so on.</p>
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<p>Everything on this site is avaliable on GitHub. Head on over and <a href='https://github.com/redoules/redoules.github.io/issues/new'>submit an issue.</a> You can also message me directly by <a href='mailto:guillaume.redoules@gadz.org'>email</a>.</p>
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