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Dump traffic on routing-instance with a Juniper SRX firewall


How can I see what interfaces belong to the default routing instance on the SRX?Juniper SRX - No traffic after 17 minutesHow to understand Juniper SRX flow creation?Juniper SRX - interface filters vs firewall rules?Juniper srx-100-b doesn't boot anymoreJuniper JUNOS security policy incorrectly blocking traffic that is explicitly permittedJuniper EX4200 How to read SNMP traffic counters for specific VLAN id from trunk interface?Juniper JunOS routing issue in v15.1.49Juniper SRX 240 Routing ConfigurationJuniper MX/SRX series interface monitoring command













2















A Juniper firewall can display data with the tcpdump command:



% tcpdump -i ge-0/0/0
% tcpdump -i vlan10


However, if the interface or the VLAN is assigned to a routing instance, the traffic is not captured. Is there a way to do it ?










share|improve this question




























    2















    A Juniper firewall can display data with the tcpdump command:



    % tcpdump -i ge-0/0/0
    % tcpdump -i vlan10


    However, if the interface or the VLAN is assigned to a routing instance, the traffic is not captured. Is there a way to do it ?










    share|improve this question


























      2












      2








      2








      A Juniper firewall can display data with the tcpdump command:



      % tcpdump -i ge-0/0/0
      % tcpdump -i vlan10


      However, if the interface or the VLAN is assigned to a routing instance, the traffic is not captured. Is there a way to do it ?










      share|improve this question
















      A Juniper firewall can display data with the tcpdump command:



      % tcpdump -i ge-0/0/0
      % tcpdump -i vlan10


      However, if the interface or the VLAN is assigned to a routing instance, the traffic is not captured. Is there a way to do it ?







      juniper juniper-junos juniper-srx tcpdump






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Apr 2 at 9:35









      Cown

      6,89631031




      6,89631031










      asked Apr 2 at 9:15









      NakruleNakrule

      20926




      20926




















          1 Answer
          1






          active

          oldest

          votes


















          3














          This works fine on the lower-end SRX models - try using the layer 3 interface bound to your VLAN eg:



          tcpdump -i vlan.10


          My configuration looks like this:



          routing-instances 
          TCPDUMP-TEST
          instance-type virtual-router;
          interface vlan.10;


          vlans
          v10-TEST
          vlan-id 10;
          l3-interface vlan.10;




          Bear in mind that you won't be able to see traffic that isn't directed at the RE (eg: destination IP address of vlan.10 interface). You also won't be able to see ICMP traffic, as this is processed via the PFE, rather than the RE.






          share|improve this answer























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            1 Answer
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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            3














            This works fine on the lower-end SRX models - try using the layer 3 interface bound to your VLAN eg:



            tcpdump -i vlan.10


            My configuration looks like this:



            routing-instances 
            TCPDUMP-TEST
            instance-type virtual-router;
            interface vlan.10;


            vlans
            v10-TEST
            vlan-id 10;
            l3-interface vlan.10;




            Bear in mind that you won't be able to see traffic that isn't directed at the RE (eg: destination IP address of vlan.10 interface). You also won't be able to see ICMP traffic, as this is processed via the PFE, rather than the RE.






            share|improve this answer



























              3














              This works fine on the lower-end SRX models - try using the layer 3 interface bound to your VLAN eg:



              tcpdump -i vlan.10


              My configuration looks like this:



              routing-instances 
              TCPDUMP-TEST
              instance-type virtual-router;
              interface vlan.10;


              vlans
              v10-TEST
              vlan-id 10;
              l3-interface vlan.10;




              Bear in mind that you won't be able to see traffic that isn't directed at the RE (eg: destination IP address of vlan.10 interface). You also won't be able to see ICMP traffic, as this is processed via the PFE, rather than the RE.






              share|improve this answer

























                3












                3








                3







                This works fine on the lower-end SRX models - try using the layer 3 interface bound to your VLAN eg:



                tcpdump -i vlan.10


                My configuration looks like this:



                routing-instances 
                TCPDUMP-TEST
                instance-type virtual-router;
                interface vlan.10;


                vlans
                v10-TEST
                vlan-id 10;
                l3-interface vlan.10;




                Bear in mind that you won't be able to see traffic that isn't directed at the RE (eg: destination IP address of vlan.10 interface). You also won't be able to see ICMP traffic, as this is processed via the PFE, rather than the RE.






                share|improve this answer













                This works fine on the lower-end SRX models - try using the layer 3 interface bound to your VLAN eg:



                tcpdump -i vlan.10


                My configuration looks like this:



                routing-instances 
                TCPDUMP-TEST
                instance-type virtual-router;
                interface vlan.10;


                vlans
                v10-TEST
                vlan-id 10;
                l3-interface vlan.10;




                Bear in mind that you won't be able to see traffic that isn't directed at the RE (eg: destination IP address of vlan.10 interface). You also won't be able to see ICMP traffic, as this is processed via the PFE, rather than the RE.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Apr 2 at 12:38









                Benjamin DaleBenjamin Dale

                7,4291038




                7,4291038



























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