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Add MSS clamp example

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SquirePug 2022-10-06 15:21:36 +11:00 committed by GitHub
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docs/configuration/policy/examples.rst
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@ -182,3 +182,32 @@ Add multiple source IP in one rule with same priority
set policy local-route rule 101 source '203.0.113.253'
set policy local-route rule 101 source '198.51.100.0/24'
###########################
Clamp MSS for a specific IP
###########################
This example shows how to target an MSS clamp (in our example to 1360 bytes)
to a specific destination IP.
.. code-block:: none
set policy route IP-MSS-CLAMP rule 10 description 'Clamp TCP session MSS to 1360 for NN.NNN.NNN.NNN'
set policy route IP-MSS-CLAMP rule 10 destination address 'NN.NNN.NNN.NNN/32'
set policy route IP-MSS-CLAMP rule 10 protocol 'tcp'
set policy route IP-MSS-CLAMP rule 10 set tcp-mss '1360'
set policy route IP-MSS-CLAMP rule 10 tcp flags 'SYN'
To apply this policy to the correct interface, configure it on the
interface the inbound local host will send through to reach our
destined target host (in our example eth1).
.. code-block:: none
set interfaces ethernet eth1 policy route IP-MSS-CLAMP
You can view that the policy is being correctly (or incorrectly) utilised
with the following command:
.. code-block:: none
show policy route statistics