How to configure 2 LAN as input and one output ports in juniper switch

Question

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.

Answer 1

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