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[mcast, vlan] match mcast NAT ingress on dst only (and not w/ the VLAN) - #408
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zeeshanlakhani wants to merge 3 commits into
Open
zeeshanlakhani wants to merge 3 commits into
zeeshanlakhani wants to merge 3 commits into
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In oxidecomputer/sidecar-lite#152 (oxidecomputer/sidecar-lite#152 (comment)), Ry reminded me that we're just a router here, that there's no VLAN isolation in the rack, and, like unicast, VLANs are not expected to be preserved across a routed boundary. Group IPs are unique in dpd, making it enough to match on the destination address for the multicast group. This work unspools the ingress table key-matching we had previously, where now multicast NAT ingress matches on `dst_addr` only. Note: we now validate the configured egress VLAN ID up front on create/update operations, before table writes occur.
zeeshanlakhani
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FelixMcFelix,
cfzimmerman and
rcgoodfellow
October 20, 2026 05:20
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In oxidecomputer/sidecar-lite#152 (oxidecomputer/sidecar-lite#152 (comment)), Ry reminded me that we're just a router here, that there's no VLAN isolation in the rack, and, like unicast, VLANs are not expected to be preserved across a routed boundary. Group IPs are unique in dpd, making it enough to match on the destination address for the multicast group.
This work unspools the ingress table key-matching we had previously, where now multicast NAT ingress matches on
dst_addronly.Note: we now validate the configured egress VLAN ID up front on create/update operations, before table writes occur.