add vpn site

Description

Adds a new remote VPN site for VPN site-to-site.

Syntax

add vpn site name <name> remote-site-link-selection { host-name remote-site-host-name <remote-site-host-name> auth-method { preshared-secret password <password> [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string>| false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] | certificate [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca>] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] } | ip-address remote-site-ip-address <remote-site-ip-address> is-site-behind-static-nat { true static-nat-ip <static-nat-ip> auth-method { preshared-secret password <password> [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] | certificate [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat>] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] } | false auth-method { preshared-secret password <password> [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] | certificate [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method>] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] } } | load-sharing link-selection-multiple-addrs addr <link-selection-multiple-addrs addr> auth-method { preshared-secret password <password> [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] | certificate [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval>] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel>] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id>| false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] } | high-availability link-selection-multiple-addrs addr <link-selection-multiple-addrs addr> auth-method { preshared-secret password <password> [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id>| false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] | certificate [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] } | connection-initiated-only-from-remote-site auth-method { preshared-secret password <password> [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] | certificate [ enabled <enabled> ] [ remote-site-enc-dom-type <remote-site-enc-dom-type> ] [ enc-profile <enc-profile> ] [ phase1-reneg-interval <phase1-reneg-interval> ] [ phase2-reneg-interval <phase2-reneg-interval> ] [ enable-perfect-forward-secrecy { true [ phase2-dh <phase2-dh> ] | false } ] [ is-check-point-site { true [ enable-permanent-vpn-tunnel <enable-permanent-vpn-tunnel> ] | false } ] [ disable-nat <disable-nat> ] [ aggressive-mode-enabled { true aggressive-mode-DH-group <aggressive-mode-DH-group> [ { aggressive-mode-enable-peer-id { true aggressive-mode-peer-id-type <aggressive-mode-peer-id-type> aggressive-mode-peer-id <aggressive-mode-peer-id> | false } | aggressive-mode-enable-gateway-id { true aggressive-mode-gateway-id-type <aggressive-mode-gateway-id-type> aggressive-mode-gateway-id <aggressive-mode-gateway-id> | false } } ] | false } ] [ enc-method <enc-method> ] [ use-trusted-ca <use-trusted-ca> ] [ match-cert-ip <match-cert-ip> ] [ match-cert-dn { true match-cert-dn-string <match-cert-dn-string> | false } ] [ match-cert-e-mail { true match-cert-e-mail-string <match-cert-e-mail-string> | false } ] [ link-selection-probing-method <link-selection-probing-method> ] } }

Parameters

Parameter

Description

aggressive-mode-DH-group

determine the strength of the key when aggressive mode is enabled

aggressive-mode- enable-gateway-id

Indicates if gateway ID matching will be used. This adds a layer of security to aggressive mode

Type: Boolean (true/false)

aggressive-mode- enable-peer-id

Indicates if peer ID matching will be used. This adds a layer of security to

aggressive mode

Type: Boolean (true/false)

aggressive-mode- enabled

main mode, is used. It is less recommended if the remote site supports IPSec main mode

Type: Boolean (true/false)

aggressive-mode- gateway-id

The gateway ID that will be used for matching when configured to

Type: vpnAggressiveModePeerId

aggressive-mode- gateway-id-type

Indicates the type of gateway ID that will be used for matching when configured

Options: domain-name, user-name

aggressive-mode- peer-id

The peer ID that will be used for matching when configured to

Type: vpnAggressiveModePeerId

aggressive-mode- peer-id-type

Indicates the type of peer ID that will be used for matching when configured

Options: domain-name, user-name

auth-method

Indicates the type of authentication used when connecting to the remote site

Type: Press TAB to see available options

disable-nat

Disable NAT for traffic to/from the remote site. Useful when one of the internal networks contains a server

Type: Boolean (true/false)

enable-perfect- forward-secrecy

Ensures that a session key will not be compromised if one of the (long-term)

private keys is compromised in the future.

Type: Boolean (true/false)

enable-permanent- vpn-tunnel

VPN Tunnels are constantly kept active and as a result, make it easier to recognize malfunctions and connectivity problems Type: Boolean (true/false)

enabled

Indicates whether or not the remote site is enabled

Type: Boolean (true/false)

enc-method

Indicates which encryption method is used

Options: ike-v1, ike-v2, prefer-ike-v2

enc-profile

Encryption profile (one of predefined profiles or custom)

Type: virtual

is-check-point-site

Enable if the remote site is connected through a Check Point Security Gateway

Type: Boolean (true/false)

is-site-behind-static- nat

Indicates if the remote site is behind static NAT

Type: Boolean (true/false)

link-selection-multiple-addrs addr

IP address

link-selection-probing- method

The type of probing used for link selection when multiple IP addresses are configured for the remote site

Options: ongoing, one-time

match-cert-dn

Indicates if certificate matching should match the DN string in the certificate to the configured DN string

Type: Boolean (true/false)

match-cert-dn-string

Indicates the configured DN string for certificate matching

Type: String

match-cert-e-mail

Indicates if certificate matching should match the E-mail string in the certificate to the configured E-mail string

Type: Boolean (true/false)

match-cert-e-mail- string

Indicates the configured E-mail string for certificate matching

Type: Email address

match-cert-ip

Indicates if certificate matching should match IP address in the certificate to the site's IP address

Type: Boolean (true/false)

name

Site name

Type: A string that begins with a letter and contains up to 32 alphanumeric (0-9, a-z, _ -) characters without spaces

password

Preshared secret (minimum 6 characters) to be used when authentication method is configured as such

Type: vpnPassword

phase1-reneg-interval

The period, in minutes, between each IKE SA renegotiation

Type: A number with no fractional part (integer)

phase2-dh

Determine the strength of the key used for the IPsec (Phase 2) key exchange process. The higher the group number, the stronger and more secure the key is.

phase2-reneg-interval

The period, in seconds, between each IPSec SA renegotiation

Type: A number with no fractional part (integer)

remote-site-enc-dom- type

The method of defining the remote site's encryption domain

Options: manually-defined-enc-dom, route-all-traffic-to-site, route-based-vpn, enc-dom-hidden-behind-remote-site

remote-site-host- name

Indicates the host name of the remote site

Type: An IP address or host name

remote-site-ip- address

Indicates the IP address of the remote site

Type: IP address

remote-site-link- selection

Indicates the method of determining the destination IP address/s of the remote site

Type: Press TAB to see available options

static-nat-ip

Indicates an external routable IP address via static NAT used by the remote site

Type: IP address

use-trusted-ca

Indicates if a specific trusted CA is used for matching the remote site's certificate or all configured trusted CAs

Example

add vpn site name site17 remote-site-link-selection host-name remote-site-host-name myHost.com auth-method preshared-secret password vpnPassword enabled true remote-site-enc-dom-type manually-defined-enc-dom enc-profile custom phase1-reneg-interval 15 phase2-reneg-interval 15 enable-perfect-forward-secrecy true phase2-dh word is-check-point-site true enable-permanent-vpn-tunnel true disable-nat true aggressive-mode-enabled true aggressive-mode-DH-group word aggressive-mode-enable-peer-id true aggressive-mode-peer-id-type domain-name aggressive-mode-peer-id vpnAggressiveModePeerId enc-method ike-v1 use-trusted-ca TEXT match-cert-ip true match-cert-dn true match-cert-dn-string TEXT match-cert-e-mail true match-cert-e-mail-string MyEmail@mail.com link-selection-probing-method ongoing enabled true remote-site-enc-dom-type manually-defined-enc-dom enc-profile custom phase1-reneg-interval 15 phase2-reneg-interval 15 enable-perfect-forward-secrecy true phase2-dh word is-check-point-site true enable-permanent-vpn-tunnel true disable-nat true aggressive-mode-enabled true aggressive-mode-DH-group word aggressive-mode-enable-peer-id true aggressive-mode-peer-id-type domain-name aggressive-mode-peer-id vpnAggressiveModePeerId enc-method ike-v1 use-trusted-ca TEXT match-cert-ip true match-cert-dn true match-cert-dn-string TEXT match-cert-e-mail true match-cert-e-mail-string MyEmail@mail.com link-selection-probing-method ongoing auth-method preshared-secret password vpnPassword enabled true remote-site-enc-dom-type manually-defined-enc-dom enc-profile custom phase1-reneg-interval 15 phase2-reneg-interval 15 enable-perfect-forward-secrecy true phase2-dh word is-check-point-site true enable-permanent-vpn-tunnel true disable-nat true aggressive-mode-enabled true aggressive-mode-DH-group word aggressive-mode-enable-peer-id true aggressive-mode-peer-id-type domain-name aggressive-mode-peer-id vpnAggressiveModePeerId enc-method ike-v1 use-trusted-ca TEXT match-cert-ip true match-cert-dn true match-cert-dn-string TEXT match-cert-e-mail true match-cert-e-mail-string MyEmail@mail.com link-selection-probing-method ongoing enabled true remote-site-enc-dom-type manually-defined-enc-dom enc-profile custom phase1-reneg-interval 15 phase2-reneg-interval 15 enable-perfect-forward-secrecy true phase2-dh word is-check-point-site true enable-permanent-vpn-tunnel true disable-nat true aggressive-mode-enabled true aggressive-mode-DH-group word aggressive-mode-enable-peer-id true aggressive-mode-peer-id-type domain-name aggressive-mode-peer-id vpnAggressiveModePeerId enc-method ike-v1 use-trusted-ca TEXT match-cert-ip true match-cert-dn true match-cert-dn-string TEXT match-cert-e-mail true match-cert-e-mail-string MyEmail@mail.com link-selection-probing-method ongoing