Arch Linux

t_wrex

Member

Registered: 2020-03-27

Posts: 34

[SOLVED] Unbound not responding to remote access IPsec clients

I have an Arch Linux router PC that has 2 interfaces named wan and lan, and is running Strongswan in a remote access configuration. I was running Bind on the router for many years with this same configuration with no issues. I am trying to switch to Unbound. My problem is that the remote clients are unable to resolve queries to Unbound. If I stop Unbound and start Bind, they resolve with no problem. Everything else about the VPN is working perfectly, VPN clients can access both internal LAN machines and the internet. I can even SSH into the router from the VPN with no problem. The LAN IP subnet is 172.16.16.0/26 and the VPN subnet is 172.16.16.64/29. The router has a LAN IP of 172.16.16.1 (the IP that I am pushing as the VPN client's DNS address) and a dynamic DHCP-provided WAN IP.

Here is unbound.conf

server:
    verbosity: 4
    interface: 0.0.0.0
    interface: ::0
    port: 53
    do-ip4: yes
    do-ip6: yes
    do-udp: yes
    do-tcp: yes
    do-daemonize: no
    access-control: 0.0.0.0/0 allow
    access-control: ::0/0 allow
    trust-anchor-file: /etc/unbound/trusted-key.key
remote-control:
    control-enable: yes
forward-zone:
    name: "."
    forward-addr: 1.1.1.1
    forward-addr: 1.0.0.1

Here is nftables.conf:

table ip nat {
        chain prerouting {
                type nat hook prerouting priority dstnat; policy accept;
        }

        chain postrouting {
                type nat hook postrouting priority srcnat; policy accept;
                ip daddr 192.168.220.0/22 accept
                ip daddr 192.168.192.0/23 accept
                ipsec out ip saddr 172.16.16.64/29 accept
                oifname "wan" masquerade 
        }
}
table inet filter {
        chain input {
                type filter hook input priority filter; policy drop;
                ip protocol icmp icmp type echo-request limit rate 2/second accept
                ip protocol icmp icmp type echo-request drop
                ct state established,related accept
                iifname "lan" accept
                iifname "lo" accept
                udp dport dhcpv6-client accept
                ip6 nexthdr ipv6-icmp accept
                ip protocol icmp accept
                ip protocol esp accept
                udp dport 500 accept
                udp dport 4500 accept
                ipsec in ip saddr 172.16.16.64/29 accept 
        }

        chain forward {
                type filter hook forward priority filter; policy drop;
                ct state established,related accept
                iifname "lan" accept
                ip6 nexthdr ipv6-icmp accept
                ip saddr 192.168.220.0/22 accept
                udp dport 4500 accept
                udp dport 500 accept
                ipsec in ip saddr 172.16.16.64/29  accept
                ip protocol esp accept
        }
}

Here is swanctl.conf:

connections {
        RA {
                local_addrs = %any
                local {
                        auth = pubkey
                        certs = ECHO.crt
                        id = %any
                }
                remote {
                        auth = pubkey
                        id = %any
                }
                children {
                        net {
                        local_ts = 0.0.0.0/0
                        esp_proposals = aes256-sha256
                        }
                }
                version = 2
                proposals = aes256-sha256-modp2048
                pools = pool
                send_cert = always
                reauth_time = 0
                rekey_time = 0
                dpd_delay = 60s
                dpd_timeout = 300s
        }
}


pools {
                pool {
                        addrs = 172.16.16.64/29
                        dns = 172.16.16.1
                }
        }

Last edited by t_wrex (2021-05-20 04:33:17)

t_wrex

Member

Registered: 2020-03-27

Posts: 34

Re: [SOLVED] Unbound not responding to remote access IPsec clients

I switched back to bind. Everything works perfectly with no other changes.

Last edited by t_wrex (2021-05-20 04:33:29)