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shpark/linux-netns.md

Created October 26, 2021 13:30
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linux-netns.md

Linux netns cheat sheet

TL;DR. You first create a network namesmace (netns), and a veth device (you also create a peer). Then you assign one end to another netns. You can talk to another netns via the veth.

TODO: How to use a different device instead of veth for communication across netns?

Create a new netns

ip netns add ns1

Run command on behalf of a netns

ip netns exec ns1 ...

Create a veth in one netns

ip netns exec ns1 ip link add veth1 type veth peer name veth2

Assign a veth end to another netns

ip link set veth2 netns ns2

You can also create veth in the default (or global) netns.

Assign IP addresses

ip addr add 192.168.1.1/24 dev veth1
ip netns exec ns2 ip addr add 192.168.1.100/24 dev veth2

Ping

ping 192.168.1.100 # or
ip netns exec ns2 ping add 192.168.1.1

Send ping to the IP address of the peer (that is assigned within another netns).

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