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IOL interfaces come in 4-port units (Ethernet0/0-3, Ethernet1/0-3, ...),
addressed like IOU as (adapter_number, port_number 0-3):
- IOLDockerVM builds EthernetAdapter(interfaces=4) per adapter and asks
the runner for adapters x 4 interfaces (num-eth).
- DockerVM threads port_number through the NIO/capture API (the compute
routes parsed it from the URL but dropped it); single-port adapters
keep the historical bridge{N} names and command sequence, multi-port
adapters get one bridge per port (bridge{a}_{p}).
- The unix-socket NIO wiring addresses sockets flat across adapters:
adapter x ports-per-adapter + port, so single-port images keep their
exact socket layout.
- The controller port list for GNS3_IOL_RUNNER docker nodes is generated
by StandardPortFactory with the IOU naming (Ethernet{segment0}/{port0},
segment size 4); plain docker nodes keep eth{N}.