juniper srx系列防火墙默认ssh管理的端口是无法更改的，但要想使用其它端口实现ssh管理，可通过将外网的其它端口映射到环回接口的22端口实现
思路：
1.新建环回接口并配置IP地址
2.将环回接口划入到loopbackzone 这个安全域，并在接口层面开放ssh管理
3.配置端口映射，将外网端口22222映射环回接口端口22上
4.放行untrust到loopbacozone ssh的流量
实验配置：
set version 12.1X47-D20.7
set system root-authentication encrypted-password "$1$Cu1r32.n$ivA34PWVEXK9lNKzaf1"
set system services ssh
set interfaces ge-0/0/0 unit 0 family inet address 192.168.2.200/24
set interfaces lo0 unit 0 family inet address 1.1.1.1/24
set security nat destination pool ssh_manage address 1.1.1.1/32
set security nat destination pool ssh_manage address port 22
set security nat destination rule-set ssh_manage from zone untrust
set security nat destination rule-set ssh_manage rule 1 match source-address 0.0.0.0/0
set security nat destination rule-set ssh_manage rule 1 match destination-address 192.168.2.200/32
set security nat destination rule-set ssh_manage rule 1 match destination-port 22222
set security nat destination rule-set ssh_manage rule 1 then destination-nat pool ssh_manage
set security policies from-zone untrust to-zone loopback_zone policy untrust-to-loopback match source-address any
set security policies from-zone untrust to-zone loopback_zone policy untrust-to-loopback match destination-address ssh-manage-address
set security policies from-zone untrust to-zone loopback_zone policy untrust-to-loopback match application junos-ssh
set security policies from-zone untrust to-zone loopback_zone policy untrust-to-loopback then permit
set security zones security-zone untrust interfaces ge-0/0/0.0 host-inbound-traffic system-services ping
set security zones security-zone loopback_zone address-book address ssh-manage-address 1.1.1.1/32
set security zones security-zone loopback_zone interfaces lo0.0 host-inbound-traffic system-services ssh
version 12.1X47-D20.7;
system {
root-authentication {
encrypted-password "$1$Cu1r32.n$ivACpMVEXK9lNKzaf1"; ## SECRET-DATA
}
services {
ssh;
}
}
interfaces {
ge-0/0/0 {
unit 0 {
family inet {
address 192.168.2.200/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 1.1.1.1/24;
}
}
}
}
security {
nat {
destination {
pool ssh_manage {
address 1.1.1.1/32 port 22;
}
rule-set ssh_manage {
from zone untrust;
rule 1 {
match {
source-address 0.0.0.0/0;
destination-address 192.168.2.200/32;
destination-port {
22222;
}
}
then {
destination-nat {
pool {
ssh_manage;
}
}
}
}
}
}
}
policies {
from-zone untrust to-zone loopback_zone {
policy untrust-to-loopback {
match {
source-address any;
destination-address ssh-manage-address;
application junos-ssh;
}
then {
permit;
}
}
}
}
zones {
security-zone untrust {
interfaces {
ge-0/0/0.0 {
host-inbound-traffic {
system-services {
ping;
}
}
}
}
}
security-zone loopback_zone {
address-book {
address ssh-manage-address 1.1.1.1/32;
}
interfaces {
lo0.0 {
host-inbound-traffic {
system-services {
ssh;
}
}
}
}
}
}
}