{"record":{"id":"f6f2e3d92be291ac","repo":"netbirdio/netbird","slug":"add-iptables-forward-rule-v","errorCode":null,"errorMessage":"add iptables forward rule: %v","messagePattern":"add iptables forward rule: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"client/firewall/nftables/router_linux.go","lineNumber":1115,"sourceCode":"\n\t\tfw = \"nftables\"\n\t\treturn r.acceptFilterRulesNftables(r.filterTable)\n\t}\n\n\tif err := r.acceptFilterRulesIptables(ipt); err != nil {\n\t\tlog.Warnf(\"iptables failed (table may be incompatible), falling back to nftables: %v\", err)\n\t\tfw = \"nftables\"\n\t\treturn r.acceptFilterRulesNftables(r.filterTable)\n\t}\n\treturn nil\n}\n\nfunc (r *router) acceptFilterRulesIptables(ipt *iptables.IPTables) error {\n\tvar merr *multierror.Error\n\n\tfor _, rule := range r.getAcceptForwardRules() {\n\t\tif err := ipt.Insert(\"filter\", chainNameForward, 1, rule...); err != nil {\n\t\t\tmerr = multierror.Append(merr, fmt.Errorf(\"add iptables forward rule: %v\", err))\n\t\t} else {\n\t\t\tlog.Debugf(\"added iptables forward rule: %v\", rule)\n\t\t}\n\t}\n\n\tinputRule := r.getAcceptInputRule()\n\tif err := ipt.Insert(\"filter\", chainNameInput, 1, inputRule...); err != nil {\n\t\tmerr = multierror.Append(merr, fmt.Errorf(\"add iptables input rule: %v\", err))\n\t} else {\n\t\tlog.Debugf(\"added iptables input rule: %v\", inputRule)\n\t}\n\n\treturn nberrors.FormatErrorOrNil(merr)\n}\n\nfunc (r *router) getAcceptForwardRules() [][]string {\n\tintf := r.wgIface.Name()\n\treturn [][]string{","sourceCodeStart":1097,"sourceCodeEnd":1133,"githubUrl":"https://github.com/netbirdio/netbird/blob/93e97f4bf1ad715072dcb3fb6cdb1763431b5a9c/client/firewall/nftables/router_linux.go#L1097-L1133","documentation":"Error \"add iptables forward rule: %v\" thrown in netbirdio/netbird.","triggerScenarios":"Thrown at client/firewall/nftables/router_linux.go:1115 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"93e97f4bf1ad715072dcb3fb6cdb1763431b5a9c","analyzedAt":"2026-08-16T03:09:19.136Z","schemaVersion":2},"datasetVersion":"2026-08-16T08:17:34.114Z"}