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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.

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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

  • does this code works for two inbound coupled together for one output as WAN ?? – Smaran Rachakonda Jul 3 '15 at 14:16
  • Yes, with the addition of a security policy from EXTERNAL to INTERNAL, you could easily use this configuration for a WAN connected site. – Benjamin Dale Jul 4 '15 at 0:41

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