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The live suite asserted the datapath over IPv4 only. Give every guest a ULA IPv6 address next to its v4 one and twin every v4 assertion point, sharing the impairment window (one filter application, both families asserted) so the runtime grows by minutes, not double. - harness: configure_ios(eth_ipv6=), ping() dispatches to `ping ipv6`, docker_bring_up_ipv6 (the Docker daemon leaves eth0 with disable_ipv6=1 on v6-less bridge networks, so the interfaces-file route cannot work), family-aware docker_wait_address, pcap_records scans every record (a leading DAD/MLD frame must not mask the sampled ethertype), and pcap_icmp_rtt measures the wire round trip from capture timestamps; - scenarios: connectivity/delay/suspend/isolation/churn checks in both families, captures assert 86dd next to 0800, the libpcap bpf drops are asserted family-selective (icmp vs icmp6, each killing its own family and leaving the other alive), the eBPF classifier modes on both families, marker v6 twins with an echo-specific expression (bare icmp6 also matches DAD/MLD and would break the exact counts), the v6 sharkd replay, and the link-local matrix gains the 86dd all-nodes row; serial (HDLC) legs stay v4-only; - the dynamips-emulated classic IOS under-reports its `ping ipv6` RTT by ~40 % of a delayed round trip (pcap-verified: the wire carries the v6 echo exchange in the same ~230 ms as v4 while the console reports ~130 ms), so the dynamips-family scenarios assert the v6 delay from the capture's own timestamps — recorded in tests/e2e/README.md. Full suite: 17 passed in 58m50s.