a VLAN maps several subnet?












1














i've read this post: Multiple Subnets in a VLAN
and am wondering about the possible conflicts when using several subnets in a VLAN.



the recommended design is of course put a IP subnet in a vlan.



if i configure several ip subnets in a vlan, e.g. some hosts in 10.1.1.0/24, some hosts in 10.2.2.0/24 and both under a vlan, will these two networks interrupt each other? if there's actually no impact then why is such design not prefered?






vlan subnet







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    1














    i've read this post: Multiple Subnets in a VLAN
    and am wondering about the possible conflicts when using several subnets in a VLAN.



    the recommended design is of course put a IP subnet in a vlan.



    if i configure several ip subnets in a vlan, e.g. some hosts in 10.1.1.0/24, some hosts in 10.2.2.0/24 and both under a vlan, will these two networks interrupt each other? if there's actually no impact then why is such design not prefered?






    vlan subnet







    share|improve this question







    New contributor




    user53815 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      1












      1








      1







      i've read this post: Multiple Subnets in a VLAN
      and am wondering about the possible conflicts when using several subnets in a VLAN.



      the recommended design is of course put a IP subnet in a vlan.



      if i configure several ip subnets in a vlan, e.g. some hosts in 10.1.1.0/24, some hosts in 10.2.2.0/24 and both under a vlan, will these two networks interrupt each other? if there's actually no impact then why is such design not prefered?






      vlan subnet







      share|improve this question







      New contributor




      user53815 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      i've read this post: Multiple Subnets in a VLAN
      and am wondering about the possible conflicts when using several subnets in a VLAN.



      the recommended design is of course put a IP subnet in a vlan.



      if i configure several ip subnets in a vlan, e.g. some hosts in 10.1.1.0/24, some hosts in 10.2.2.0/24 and both under a vlan, will these two networks interrupt each other? if there's actually no impact then why is such design not prefered?






      vlan subnet




      vlan subnet






      share|improve this question







      New contributor




      user53815 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      user53815 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






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      user53815 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 2 hours ago









      user53815

      212




      212




      New contributor




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      user53815 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          1 Answer
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          2














          This is possible however:




          • you still need a router to have the hosts from one subnet to communicate with the hosts in the other subnet

          • in a modern switched environment there's no collision, so this is not a issue, but you still have broadcast. All hosts will see the broadcasts from both domains which take some part of the bandwidth.

          • Access Control Lists are bounded to interfaces. So to use ACL to limit traffic between the subnets you are limited to a single interface to place ingress / outgress rules; this is stil doable but more limited

          • any host can potentially hear some traffic pertaining to the other subnet. That's a security issue.

          • when troubleshooting a network issue, you may have to sniff traffic (with utility like tcpdump or wireshark), having several IP networks mixed render this or other troubleshooting more difficult

          • overall, this is more complex to maintain and less scalable than having one subnet per vlan.


          Basically there's just no benefit in doing so.






          share|improve this answer























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            1 Answer
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            active

            oldest

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            1 Answer
            1






            active

            oldest

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            active

            oldest

            votes






            active

            oldest

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            2














            This is possible however:




            • you still need a router to have the hosts from one subnet to communicate with the hosts in the other subnet

            • in a modern switched environment there's no collision, so this is not a issue, but you still have broadcast. All hosts will see the broadcasts from both domains which take some part of the bandwidth.

            • Access Control Lists are bounded to interfaces. So to use ACL to limit traffic between the subnets you are limited to a single interface to place ingress / outgress rules; this is stil doable but more limited

            • any host can potentially hear some traffic pertaining to the other subnet. That's a security issue.

            • when troubleshooting a network issue, you may have to sniff traffic (with utility like tcpdump or wireshark), having several IP networks mixed render this or other troubleshooting more difficult

            • overall, this is more complex to maintain and less scalable than having one subnet per vlan.


            Basically there's just no benefit in doing so.






            share|improve this answer




























              2














              This is possible however:




              • you still need a router to have the hosts from one subnet to communicate with the hosts in the other subnet

              • in a modern switched environment there's no collision, so this is not a issue, but you still have broadcast. All hosts will see the broadcasts from both domains which take some part of the bandwidth.

              • Access Control Lists are bounded to interfaces. So to use ACL to limit traffic between the subnets you are limited to a single interface to place ingress / outgress rules; this is stil doable but more limited

              • any host can potentially hear some traffic pertaining to the other subnet. That's a security issue.

              • when troubleshooting a network issue, you may have to sniff traffic (with utility like tcpdump or wireshark), having several IP networks mixed render this or other troubleshooting more difficult

              • overall, this is more complex to maintain and less scalable than having one subnet per vlan.


              Basically there's just no benefit in doing so.






              share|improve this answer


























                2












                2








                2






                This is possible however:




                • you still need a router to have the hosts from one subnet to communicate with the hosts in the other subnet

                • in a modern switched environment there's no collision, so this is not a issue, but you still have broadcast. All hosts will see the broadcasts from both domains which take some part of the bandwidth.

                • Access Control Lists are bounded to interfaces. So to use ACL to limit traffic between the subnets you are limited to a single interface to place ingress / outgress rules; this is stil doable but more limited

                • any host can potentially hear some traffic pertaining to the other subnet. That's a security issue.

                • when troubleshooting a network issue, you may have to sniff traffic (with utility like tcpdump or wireshark), having several IP networks mixed render this or other troubleshooting more difficult

                • overall, this is more complex to maintain and less scalable than having one subnet per vlan.


                Basically there's just no benefit in doing so.






                share|improve this answer














                This is possible however:




                • you still need a router to have the hosts from one subnet to communicate with the hosts in the other subnet

                • in a modern switched environment there's no collision, so this is not a issue, but you still have broadcast. All hosts will see the broadcasts from both domains which take some part of the bandwidth.

                • Access Control Lists are bounded to interfaces. So to use ACL to limit traffic between the subnets you are limited to a single interface to place ingress / outgress rules; this is stil doable but more limited

                • any host can potentially hear some traffic pertaining to the other subnet. That's a security issue.

                • when troubleshooting a network issue, you may have to sniff traffic (with utility like tcpdump or wireshark), having several IP networks mixed render this or other troubleshooting more difficult

                • overall, this is more complex to maintain and less scalable than having one subnet per vlan.


                Basically there's just no benefit in doing so.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 2 mins ago

























                answered 53 mins ago









                JFL

                10.5k11235




                10.5k11235






















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