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Insert MSS clamping for traffic arriving services #1025

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merged 1 commit into from
Dec 14, 2020

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mangelajo
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OVN load balancing does not propagate fragment ICMPs down to the
services, so when fragmentation becomes necessary the TCP stack
of the service pod won't be able to detect this situation.

Until this is fixed in OVN this workaround (to be enhanced later)
will fix TCP.

Fixes-Issue: #1022

Signed-off-by: Miguel Angel Ajo [email protected]

@mangelajo mangelajo added blocker A blocker bug datapath Datapath related issues or enhancements OVN labels Dec 14, 2020
@mangelajo mangelajo self-assigned this Dec 14, 2020
@mangelajo
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one note after questions in slack:

My plan is to implement PMTU discovery in 0.8.1 so we can use it here. Also... we need to go down to the OVN bug itself and get it fixed.

OVN load balancing does not propagate fragment ICMPs down to the
services, so when fragmentation becomes necessary the TCP stack
of the service pod won't be able to detect this situation.

Until this is fixed in OVN this workaround (to be enhanced later)
will fix TCP.

Fixes-Issue: submariner-io#1022

Signed-off-by: Miguel Angel Ajo <[email protected]>
@tpantelis tpantelis merged commit 05d50fc into submariner-io:master Dec 14, 2020
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4 participants