[strongSwan] Unspecified dns added when using swanctl

[Glen Huang]

Hi,

I have this simple swanctl.conf

connections {
    vpn {
        version = 2
        pools = ios_pool
        local-psk {
            auth = psk
        }
        local-pubkey {
            auth = pubkey
            pubkeys = vpn.pem
        }
        children {
            home {
                local_ts = 0.0.0.0/0
            }
        }
    }
}

pools {
    ios_pool {
        addrs = 192.168.37.0/24
        dns = 8.8.8.8,8.8.4.4
    }
}

secrets {
    ike-ios {
        secret = aaa
    }
}

I expect a connected client to have 8.8.8.8 and 8.8.4.4 as dns, but it actually 
also contains 127.0.0.1 in addition to the two. I wonder if it’s by design? How 
can I ask charon not to send the unspecified 127.0.0.1 dns?

Regards
Glen