Add ip-veth

docs/linux/fs-btrfs.md

@@ -32,6 +32,10 @@ btrfs filesystem resize ID:max /mnt/dmp/
 ```
 #### Defragment / compress
 ```bash
+mount -o compress=zstd:15 -t /dev/sdx /mnt
+
+# or
+
 btrfs filesystem defragment -v -clzo /boot/*
 
 # or

docs/linux/network.md

@@ -16,6 +16,11 @@ iptables -L -vn
 iptables -t mangle -A POSTROUTING -j TTL --ttl-set 65
 ```
 
+## IP
+```bash
+ip link add dev ve1 type veth peer name ve2 netns ns1
+```
+
 ## TC
 ```bash
 #!/bin/bash