Juniper Switch – How to Configure 2 LAN as Input and One Output Ports

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i would like to know how i can configure juniper "SRX100" switch such that there i can connect two LAN's for inbound traffic and one outbound traffic.

Best Answer

The basic process is as follows:

  1. Configure your VLANs

    set vlans v100-INTERNAL1 vlan-id 100
set vlans v101-INTERNAL2 vlan-id 101
set vlans v102-EXTERNAL vlan-id 102

  2. Attach VLANs to switch ports

    set interfaces fe-0/0/0 unit 0 family ethernet-switching vlan-members v100-INTERNAL1
set interfaces fe-0/0/1 unit 0 family ethernet-switching vlan-members v101-INTERNAL2
set interfaces fe-0/0/2 unit 0 family ethernet-switching vlan-members v102-EXTERNAL

  3. Configure IP Interfaces

    set interfaces vlan unit 100 family inet address 192.168.100.1/24
set interfaces vlan unit 101 family inet address 192.168.101.1/24
set interfaces vlan unit 102 family inet address 192.168.102.1/24

  4. Attach IP interfaces to VLANs

    set vlans v100-INTERNAL1 l3-interface vlan.100
set vlans v101-INTERNAL2 l3-interface vlan.101
set vlans v102-EXTERNAL l3-interface vlan.102

  5. Configure a default route

    set routing-options static route 0.0.0.0/0 next-hop 192.168.102.254

  6. Create Security Zones

    set security zones security-zone INTERNAL host-inbound-traffic system-services all
set security zones security-zone EXTERNAL host-inbound-traffic ping

  7. Attach IP Interfaces to Security Zones

    set security zones security-zone EXTERNAL interfaces vlan.102
set security zones security-zone INTERNAL interfaces vlan.100
set security zones security-zone INTERNAL interfaces vlan.101

  8. Create security policies 

    set security policies from-zone INTERNAL to-zone EXTERNAL policy PERMIT-OUTBOUND match source-address any destination-address any application any
set security policies from-zone INTERNAL to-zone EXTERNAL policy PERMIT-OUTBOUND then permit
set security policies from-zone INTERNAL to-zone INTERNAL policy PERMIT-INTERNAL match source-address any destination-address any application any
set security policies from-zone INTERNAL to-zone INTERNAL policy PERMIT-INTERNAL then permit

Hopefully the topology is fairly self-explanatory - just substitute the IP Addresses you wish to use.

If you are connecting to the Internet on the EXTERNAL network, I would recommend tightening up the security policies to only allow specific subnets out, and specific applications

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