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--- wiki2:linux-networking-tools [2020/04/16 11:34]
alfred [ipsec command]
+++ wiki2:linux-networking-tools [2020/11/04 12:04] (actual)
@@ Línea 50: / Línea 50: @@
 ===== routes =====
+==== Which ip has a domain? ====
+<code>
+alfred@Y50-70:~$ nslookup couch00.dev.getfinancing.us
+Server:		127.0.0.53
+Address:	127.0.0.53#53
+Non-authoritative answer:
+Name:	couch00.dev.getfinancing.us
+Address: 10.1.50.195
+Name:	couch00.dev.getfinancing.us
+Address: 10.1.51.200
+Name:	couch00.dev.getfinancing.us
+Address: 10.1.52.100
+</code>
+==== What's your routing table? ====
+<code>
+alfred@Y50-70:~$ route -n
+Kernel IP routing table
+Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
+.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 enp9s0
+.1.0.0        0.0.0.0         255.255.0.0     U     50     0        0 tun0
+.231.231.68   192.168.1.1     255.255.255.255 UGH   100    0        0 enp9s0
+.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 virbr0
+.168.1.0     0.0.0.0         255.255.255.0   U     100    0        0 enp9s0
+.168.1.1     0.0.0.0         255.255.255.255 UH    100    0        0 enp9s0
+.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
+.168.255.1   192.168.255.21  255.255.255.255 UGH   50     0        0 tun0
+.168.255.21  0.0.0.0         255.255.255.255 UH    50     0        0 tun0
+</code>
 ===== DNS =====
+You can query dns records with the dig command. To do that, for example, for obtaining the CNAME record for url6816.alfredgg.dev:
+<code>
+dig cname url6816.alfredgg.dev
+</code>
 ===== VPN with strongswan =====
@@ Línea 61: / Línea 94: @@
   * ''ipsec restart'' restarts the service.
 ==== Troubleshooting ====
+===== Mapping the network =====
+===== Which ports are open? =====
+Locally and simply:
+<code>
+nmap localhost
+</code>
+Remotely:
+<code>
+nmap -Pn -p 51414 95.169.230.182
+</code>
+Comprueba el puerto 51414 de 95.169.230.182.
+Hay la posibilidad de lanzarlo via web desde: http://nmap.online-domain-tools.com/
+==== Discover IP's ====
+<code>
+nmap -sP 192.168.1.*
+</code>
+<code>
+nmap -sn 192.168.1.0/24
+</code>
+===== Emulate network problems =====
+  * https://medium.com/@docler/network-issues-simulation-how-to-test-against-bad-network-conditions-b28f651d8a96
+  * https://wiki.linuxfoundation.org/networking/netem
+You will use "tc" command:
+<code>
+sudo tc qdisc add dev eth0 root netem delay 1s
+sudo tc qdisc del dev eth0 root
+</code>
+For example, to simulate problems with dockers you will do the next:
+  - ''docker inspect container'' -> And take the value for the IPAddress
+  - ''route -n'' -> To see which device is used for that container
+  - ''sudo tc qdisc add dev <device> root netem delay 1s''
+  - Test it with a ping.
+  - ''sudo tc qdisc del dev <device> root''
+==== Other examples ====
+<code>
+tc qdisc add dev eth0 root netem loss 5%
+tc qdisc change dev eth0 root netem corrupt 2%
+tc qdisc change dev eth0 root netem duplicate 1%
+</code>
+===== How to... =====
+==== Update DNS in Ubuntu 18.04 ====
+Previously you only need to edit the ''/etc/resolv.conf''
+In new versions Netplan manages the network. You can configure it on files places on ''/etc/netplan''; these have an yml format.
+This is an example:
+<code>
+network:
+  version: 2
+  renderer: networkd
+  ethernets:
+    ens3:
+      dhcp4: no
+      addresses:
+        - 192.168.121.199/24
+      gateway4: 192.168.121.1
+      nameservers:
+          addresses: [8.8.8.8, 8.8.4.4]
+</code>
+To update from changes do:
+<code>
+netplan apply
+</code>
+To list dns entries:
+<code>
+systemd-resolve --status
+</code>
+==== ... know... ====
+=== ... The default gateway? ===
+<code>
+$ route -n
+.0.0.0         91.126.134.177  0.0.0.0         UG    100    0        0 ens18
+</code>

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