Site to Site VPN Juniper SRX to Fritz!Box

4/18/2017 | Comments: 9

I had to make an site to site ipsec connection between a Juniper SRX and a Fritz!box.
Now the configuration is not that easy on the Fritz!box so i will post the configurations of both devices here.

Things to remember:
- Fritz!Box : You can't use the 192.168.178.0/24 subnet for your internal network, the tool below don't let you.
- Fritz!Box : You can use the tool which is made available by AVM to generate you own config for the Fritz!Box. You can download it from: https://en.avm.de/service/vpn/overview/

- Juniper SRX: add the tunnel interface in a security zone!

You can change the proposals in the Fritz!Box config to the following

IKE:
http://www.ebsa.nl/data/_uploaded/media/ike_1.pdf

IPsec:
http://www.ebsa.nl/data/_uploaded/media/ipsec_2.pdf

The config of the Fritz!Box vpn connection is done within the following menu:
Internet -> Permit Access : Tab VPN

 

Juniper

interfaces {
    st0 {
        unit 1 {
            family inet {
            }
        }
    }
}
routing-options {
    static {
        route 192.168.120.0/24 next-hop st0.1;
    }
}
security {
    ike {
        proposal fritzbox {
            authentication-method pre-shared-keys;
            dh-group group1;
            authentication-algorithm sha1;
            encryption-algorithm aes-128-cbc;
            lifetime-seconds 3600;
        }
        policy ike-policy-cfgr2 {
            mode aggressive;
            proposals fritzbox;
            pre-shared-key ascii-text "key"; ## SECRET-DATA
        }
        gateway ike-gate-cfgr2 {
            ike-policy ike-policy-cfgr2;
            address %external_IP_Fritzbox%;
            external-interface ge-0/0/0.0;
            version v1-only;
        }
    }
    ipsec {
        policy ipsec-policy-cfgr2 {
            perfect-forward-secrecy {
                keys group1;
            }
            proposal-set standard;
        }
        vpn ipsec-vpn-cfgr2 {
            bind-interface st0.1;
            ike {
                gateway ike-gate-cfgr2;
                ipsec-policy ipsec-policy-cfgr2;
            }
            establish-tunnels immediately;
        }
    }
    address-book {
        global {
            address net-cfgr_192-168-1-0--24 192.168.1.0/24;
            address subnet_ext 192.168.120.0/24;
        }
    }
    policies {
        from-zone trust to-zone vpn-1 {
            policy trust-vpn-1-cfgr {
                match {
                    source-address net-cfgr_192-168-1-0--24;
                    destination-address subnet_ext;
                    application any;
                }
                then {
                    permit;
                }
            }
        }
        from-zone vpn-1 to-zone trust {
            policy vpn-1-trust-cfgr {
                match {
                    source-address subnet_ext;
                    destination-address net-cfgr_192-168-1-0--24;
                    application any;
                }
                then {
                    permit;
                }
            }
        }

        security-zone vpn-1 {
            interfaces {
                st0.1;
            }
        }
    }
}

Fritz!box

vpncfg {
        connections {
                enabled = yes;
                conn_type = conntype_lan;
                name = "vpn-to-srx";
                always_renew = no;
                reject_not_encrypted = no;
                dont_filter_netbios = yes;
                localip = 0.0.0.0;
                local_virtualip = 0.0.0.0;
                remoteip = %ip-of-SRX%;
                remote_virtualip = 0.0.0.0;
                localid {
                        ipaddr = %Local-External-IP%;
                }
                remoteid {
                        ipaddr = %ip-of-SRX%;
                }
                mode = phase1_mode_aggressive;
                phase1ss = "def/3des/sha";
                keytype = connkeytype_pre_shared;
                key = "KEY";
                cert_do_server_auth = no;
                use_nat_t = yes;
                use_xauth = no;
                use_cfgmode = no;
                phase2localid {
                        ipnet {
                                ipaddr = 192.168.120.0;
                                mask = 255.255.255.0;
                        }
                }
                phase2remoteid {
                        ipnet {
                                ipaddr = 192.168.1.0;
                                mask = 255.255.255.0;
                        }
                }
                phase2ss = "esp-all-all/ah-all/comp-all/pfs";
                accesslist = "permit ip any 192.168.1.0 255.255.255.0";
        }
        ike_forward_rules = "udp 0.0.0.0:500 0.0.0.0:500", 
                            "udp 0.0.0.0:4500 0.0.0.0:4500";
}

 


Comments

Ben   12/10/2017

Hey, you're awesome for sharing!

I'm still getting issues with the tunnel...
In the Fritzbox, I'm getting:
IKE-Error 0x2026 "no proposal chosen"

I've tried changing the IPsec proposal-set to 'compatible', as this has causes me headaches with other VPN connections, but no luck...

Any idea what else it could be?

Kelwhinly   1/15/2019

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Alexander   5/2/2019

Hi,
Small mismatch in phase1 proposal, use settings below on Juniper SRX :

set security ike proposal fritzbox encryption-algorithm 3des-cbc

Thanks, your post helped a lot :-)

usgniiMef   1/29/2020

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Shasta Matthew   2/11/2020

Nice article, I'm a fan of fritzbox-7590. They have a pretty good solution to the problem -- revocation to an IP address. A simple hash to get one IP is the most trivial of the solutions I could think of. If the router is compromising your laptop's IP, it is unlikely your router has compromised your router's network. And if you think that the router is compromised, it isn't at all likely that it is compromised.

Cristina nelson   2/20/2020

I love using a fritz box router. It has amazing connections that really help me do my online job better than before. Now I can relax and do my job without thinking about any worries.

tunnel ok no data   5/18/2020

hey,

thanks for this manual.
i have setup the tunnel as described and changed the proposal as suggested by Alexander.
The tunnel comes up. and no data flowes (the srx receives 0 bytes) after a few minutes the fritzbox disconnect "dead peer detection"

any idea how to trubleshoot?

Koos147   5/19/2020

I found an easy solution
On the fritzbox side choose connect to another fritzbox.

On the srx

edit security ike

policy fb-test {
mode aggressive;
proposal-set compatible;
pre-shared-key ascii-text "the pre-shared-key"; ## SECRET-DATA
}
gateway fb-test {
ike-policy fb-test;
address ip-of-the-fritzbox;
external-interface ge-0/0/0;
version v1-only;
}


edit security ipsec

proposal fritzbox {
protocol esp;
authentication-algorithm hmac-sha1-96;
encryption-algorithm aes-256-cbc;
lifetime-seconds 3600;
}

policy fb-test {
perfect-forward-secrecy {
keys group2;
}
proposals fritzbox;
}

vpn fb-test {
bind-interface st0.1;
ike {
gateway fb-test;
ipsec-policy fb-test;
}
establish-tunnels immediately;
}

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