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MTU is smaller than necessary for vx-submariner path #301

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mangelajo opened this issue Jan 29, 2020 · 3 comments
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MTU is smaller than necessary for vx-submariner path #301

mangelajo opened this issue Jan 29, 2020 · 3 comments
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@sridhargaddam
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bug Something isn't working datapath Datapath related issues or enhancements enhancement New feature or request ocs

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@mangelajo
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We use vx-submariner to achieve src-ip preservation of pods.

But vx-submariner MTU is not calculated and uses a fixed 1450. We should identify the outgoing interface, and adapt the interface to use interface.mtu - 50 (Vxlan overhead).
@mangelajo mangelajo added bug Something isn't working datapath Datapath related issues or enhancements enhancement New feature or request labels Jan 29, 2020
@mangelajo
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@sridhargaddam I added you to this one since you were working on the other related fix, and you are very familiar with this part, but let me know if you are busy and wand me to look at it.

@sridhargaddam
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@sridhargaddam I added you to this one since you were working on the other related fix, and you are very familiar with this part, but let me know if you are busy and wand me to look at it.

No problem @mangelajo, I'll work on the necessary changes and push the PR.

sridhargaddam added a commit to sridhargaddam/submariner that referenced this issue Jan 30, 2020
@sridhargaddam
Fix MTU on vx-submariner interface
d861b0c 
Currently the MTU on Submariner VXLAN interface is hardcoded to 1450.
In some of the environments Jumbo frames are used. So, ideally
Submariner should identify the outgoing interface and configure
the appropriate MTU. This patch fixes it.

Fixes Issue# submariner-io#301

Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
@sridhargaddam sridhargaddam mentioned this issue Jan 30, 2020
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mangelajo pushed a commit that referenced this issue Jan 31, 2020
@sridhargaddam @mangelajo
Fix MTU on vx-submariner interface
a07a8ab 
Currently the MTU on Submariner VXLAN interface is hardcoded to 1450.
In some of the environments Jumbo frames are used. So, ideally
Submariner should identify the outgoing interface and configure
the appropriate MTU. This patch fixes it.

Fixes Issue# #301

Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
@sridhargaddam
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The necessary fix is now merged in Submariner repo.

@mangelajo mangelajo added the ocs label Feb 24, 2020
novad03 pushed a commit to novad03/k8s-submariner that referenced this issue Nov 25, 2023
@sridhargaddam @mangelajo
Fix MTU on vx-submariner interface
ed563dd 
Currently the MTU on Submariner VXLAN interface is hardcoded to 1450.
In some of the environments Jumbo frames are used. So, ideally
Submariner should identify the outgoing interface and configure
the appropriate MTU. This patch fixes it.

Fixes Issue# submariner-io/submariner#301

Signed-off-by: Sridhar Gaddam <sgaddam@redhat.com>
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