netdev - [PATCH] veth.4: Add a more direct example

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Message-Id: <20200518205828.13905-1-djpohly@gmail.com>
Date:   Mon, 18 May 2020 15:58:28 -0500
From:   "Devin J. Pohly" <djpohly@...il.com>
To:     mtk.manpages@...il.com
Cc:     linux-man@...r.kernel.org, netdev@...r.kernel.org,
        stephen@...workplumber.org, "Devin J. Pohly" <djpohly@...il.com>
Subject: [PATCH] veth.4: Add a more direct example

iproute2 allows you to specify the netns for either side of a veth
interface at creation time.  Add an example of this to veth(4) so it
doesn't sound like you have to move the interfaces in a separate step.

Verified with commands:
    # ip netns add alpha
    # ip netns add bravo
    # ip link add foo netns alpha type veth peer bar netns bravo
    # ip -n alpha link show
    # ip -n bravo link show
---
 man4/veth.4 | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/man4/veth.4 b/man4/veth.4
index 20294c097..2d59882a0 100644
--- a/man4/veth.4
+++ b/man4/veth.4
@@ -63,13 +63,23 @@ A particularly interesting use case is to place one end of a
 .B veth
 pair in one network namespace and the other end in another network namespace,
 thus allowing communication between network namespaces.
-To do this, one first creates the
+To do this, one can provide the
+.B netns
+parameter when creating the interfaces:
+.PP
+.in +4n
+.EX
+# ip link add <p1-name> netns <p1-ns> type veth peer <p2-name> netns <p2-ns>
+.EE
+.in
+.PP
+or, for an existing
 .B veth
-device as above and then moves one side of the pair to the other namespace:
+pair, move one side to the other namespace:
 .PP
 .in +4n
 .EX
-# ip link set <p2-name> netns <p2-namespace>
+# ip link set <p2-name> netns <p2-ns>
 .EE
 .in
 .PP
-- 
2.26.2