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Enable IPv4/IPv6 forwarding on demand automatically #5833

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merged 1 commit into from
Jan 4, 2024
Merged

Enable IPv4/IPv6 forwarding on demand automatically #5833

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16 changes: 9 additions & 7 deletions pkg/agent/route/route_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -182,15 +182,17 @@ func (c *Client) Initialize(nodeConfig *config.NodeConfig, done func()) error {
return fmt.Errorf("failed to initialize ip routes: %v", err)
}

// Ensure IPv4 forwarding is enabled if it is a dual-stack or IPv4-only cluster.
if c.nodeConfig.NodeIPv4Addr != nil {
if err := sysctl.EnsureSysctlNetValue("ipv4/ip_forward", 1); err != nil {
return fmt.Errorf("failed to enable IPv4 forwarding: %w", err)
}
}

// Ensure IPv6 forwarding is enabled if it is a dual-stack or IPv6-only cluster.
if c.nodeConfig.NodeIPv6Addr != nil {
sysctlFilename := "ipv6/conf/all/forwarding"
v, err := sysctl.GetSysctlNet(sysctlFilename)
if err != nil {
return fmt.Errorf("failed to read value of sysctl file: %s", sysctlFilename)
}
if v != 1 {
return fmt.Errorf("IPv6 forwarding is not enabled")
if err := sysctl.EnsureSysctlNetValue("ipv6/conf/all/forwarding", 1); err != nil {
return fmt.Errorf("failed to enable IPv6 forwarding: %w", err)
}
}

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