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[goldman@server ~]$ sudo iptables -t nat -nL iptables -nL Chain PREROUTING (policy ACCEPT) target prot opt source destination DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCAL Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination DOCKER 0 -- 0.0.0.0/0 !127.0.0.0/8 ADDRTYPE match dst-type LOCAL Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE 0 -- 172.17.0.0/16 0.0.0.0/0 MASQUERADE 0 -- 172.18.0.0/16 0.0.0.0/0 Chain DOCKER (2 references) target prot opt source destination RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 Fatal: can't open lock file /run/xtables.lock: Permission denied [goldman@server ~]$ sudo iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy DROP) target prot opt source destination DOCKER-USER 0 -- 0.0.0.0/0 0.0.0.0/0 DOCKER-ISOLATION-STAGE-1 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain DOCKER (2 references) target prot opt source destination Chain DOCKER-ISOLATION-STAGE-1 (1 references) target prot opt source destination DOCKER-ISOLATION-STAGE-2 0 -- 0.0.0.0/0 0.0.0.0/0 DOCKER-ISOLATION-STAGE-2 0 -- 0.0.0.0/0 0.0.0.0/0 RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 Chain DOCKER-ISOLATION-STAGE-2 (2 references) target prot opt source destination DROP 0 -- 0.0.0.0/0 0.0.0.0/0 DROP 0 -- 0.0.0.0/0 0.0.0.0/0 RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 Chain DOCKER-USER (1 references) target prot opt source destination RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 [goldman@server ~]$ sudo iptables -t nat -nL Chain PREROUTING (policy ACCEPT) target prot opt source destination DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCAL Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination DOCKER 0 -- 0.0.0.0/0 !127.0.0.0/8 ADDRTYPE match dst-type LOCAL Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE 0 -- 172.17.0.0/16 0.0.0.0/0 MASQUERADE 0 -- 172.18.0.0/16 0.0.0.0/0 Chain DOCKER (2 references) target prot opt source destination RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 [goldman@server ~]$ sudo iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy DROP) target prot opt source destination DOCKER-USER 0 -- 0.0.0.0/0 0.0.0.0/0 DOCKER-ISOLATION-STAGE-1 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 ACCEPT 0 -- 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain DOCKER (2 references) target prot opt source destination Chain DOCKER-ISOLATION-STAGE-1 (1 references) target prot opt source destination DOCKER-ISOLATION-STAGE-2 0 -- 0.0.0.0/0 0.0.0.0/0 DOCKER-ISOLATION-STAGE-2 0 -- 0.0.0.0/0 0.0.0.0/0 RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 Chain DOCKER-ISOLATION-STAGE-2 (2 references) target prot opt source destination DROP 0 -- 0.0.0.0/0 0.0.0.0/0 DROP 0 -- 0.0.0.0/0 0.0.0.0/0 RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 Chain DOCKER-USER (1 references) target prot opt source destination RETURN 0 -- 0.0.0.0/0 0.0.0.0/0 [goldman@server ~]$