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MTU size of VXLAN interface should not be greater than 1450 #67

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yoheiueda opened this issue Jun 30, 2022 · 0 comments · Fixed by #68
Closed

MTU size of VXLAN interface should not be greater than 1450 #67

yoheiueda opened this issue Jun 30, 2022 · 0 comments · Fixed by #68
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MTU of a VXLAN interface in a pod VM becomes greater than 1450, which is the maximum allowed size for VxLAN packets, when a CNI plugin such as Calico IPIP uses a MTU greater than 1450. This may cause undesirable packet fragmentation.

cloud-api-adaptor/pkg/podnetwork/tunneler/vxlan/podnode.go

Lines 66 to 67 in 142b612

mtu := int(config.MTU)
if err := podNS.SetMTU(podVxlanInterface, mtu); err != nil {

@yoheiueda yoheiueda added the bug Something isn't working label Jun 30, 2022
yoheiueda added a commit to yoheiueda/cloud-api-adaptor that referenced this issue Jun 30, 2022
@yoheiueda
pkg: Do not set MTU greater than 1450 for VXLAN
f84daf1 
MTU of a VXLAN interface in a pod VM becomes greater than 1450,
which is the maximum allowed size for VxLAN packets, when a CNI
plugin such as Calico IPIP uses a MTU greater than 1450. This may
cause undesirable packet fragmentation. This patch fixes the issue.

Fixes confidential-containers#67

Signed-off-by: Yohei Ueda <yohei@jp.ibm.com>
@yoheiueda yoheiueda mentioned this issue Jun 30, 2022
Merged
bpradipt pushed a commit that referenced this issue Jul 1, 2022
@yoheiueda @bpradipt
pkg: Do not set MTU greater than 1450 for VXLAN
e1a94aa 
MTU of a VXLAN interface in a pod VM becomes greater than 1450,
which is the maximum allowed size for VxLAN packets, when a CNI
plugin such as Calico IPIP uses a MTU greater than 1450. This may
cause undesirable packet fragmentation. This patch fixes the issue.

Fixes #67

Signed-off-by: Yohei Ueda <yohei@jp.ibm.com>
@yoheiueda yoheiueda mentioned this issue Jul 4, 2022
Open
bpradipt pushed a commit to bpradipt/cloud-api-adaptor that referenced this issue Aug 12, 2023
@yoheiueda @bpradipt
pkg: Do not set MTU greater than 1450 for VXLAN
8db5ee9 
MTU of a VXLAN interface in a pod VM becomes greater than 1450,
which is the maximum allowed size for VxLAN packets, when a CNI
plugin such as Calico IPIP uses a MTU greater than 1450. This may
cause undesirable packet fragmentation. This patch fixes the issue.

Fixes confidential-containers#67

Signed-off-by: Yohei Ueda <yohei@jp.ibm.com>
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pkg: Do not set MTU greater than 1450 for VXLAN yoheiueda/cloud-api-adaptor
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