netdev - [iproute PATCH 3/8] man: tc-csum.8: Add an example

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Message-Id: <1458165384-900-4-git-send-email-phil@nwl.cc>
Date:	Wed, 16 Mar 2016 22:56:19 +0100
From:	Phil Sutter <phil@....cc>
To:	Stephen Hemminger <shemming@...cade.com>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org
Subject: [iproute PATCH 3/8] man: tc-csum.8: Add an example

Signed-off-by: Phil Sutter <phil@....cc>
---
 man/man8/tc-csum.8 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/man/man8/tc-csum.8 b/man/man8/tc-csum.8
index 9d00aae346af0..3a64c82f09ba8 100644
--- a/man/man8/tc-csum.8
+++ b/man/man8/tc-csum.8
@@ -49,6 +49,21 @@ UDPLite header
 .TP
 .B SWEETS
 These are merely syntactic sugar and ignored internally.
+.SH EXAMPLES
+The following performs stateless NAT for incoming packets from 192.168.1.100 to
+new destination 18.52.86.120 (0x12345678 in hex). Assuming these are UDP
+packets, both IP and UDP checksums have to be recalculated:
+
+.RS
+.EX
+# tc qdisc add dev eth0 ingress handle ffff:
+# tc filter add eth0 prio 1 protocol ip parent ffff: \\
+	u32 match ip src 192.168.1.100/32 flowid :1 \\
+	action pedit munge ip dst set 0x12345678 pipe \\
+	csum ip and udp
+.EE
+.RE
+
 .SH SEE ALSO
 .BR tc (8),
 .BR tc-pedit (8)
-- 
2.7.2