2 VLAN ACL with what Miss me

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• Inter-Vlan ACL

  Hi all

  I'm having some trouble getting the ACL work they way I want. I have a lot of clients in differnet VLAN (vlan 6-10) and my ASA (10.1.99.254) on vlan 99 for internet access. I need VLAN 6-10, to have access to the ASA for internet, but VLAN 6-10 should not have access to the other. For the moment, I do apply the access group of rules in the directon out on the vlan 6 SVI.

  VLAN 6-10.2.1.0/24

  VLAN 7-10.2.2.0/24

  VLAN 8-10.2.3.0/24

  VLAN 9-10.2.4.0/24

  I tried

  10 permit ip 10.1.99.254 0.0.0.255 10.2.0.0 0.0.255.255

  20. denying a whole

  I could do a ping of the ASA and made was not able to access the other vlan. However, I also don't no matter what internet access. DNS responses are not passed without traffic ICMP passed the ASA.

  The switch is a 3560G

  Any help would be appreciated.

  Robert

  The acl should not prevent the devices in the same vlan talk to each other, it will stop devices outside of this vlan only so what you see is not good.

  Regarding your general question, usually you use inbound ACL on the source rather than outgoing ACL on the destination VLAN vlan. You can use either but blocking the packets at the source is the most common approach.

  So if I understand correctly, you need to block all traffic between any vlan 10.2.x.x/24 subnet?

  If so and you are not bothered on the specification of the source IP subnet in each acl.

  extended IP access list

  deny ip any 10.2.0.0 0.0.255.255

  allow an ip

  int vlan 10

  IP access-group to

  So let's say vlan 10 is 10.2.5.0/24. What the foregoing, block any package from clients in the vlan 10 with a IP address of destination of 10.2.x.x. All other packets will be allowed. This same acl could apply to all L3 10.2.x.x VLAN interfaces.

  Note that, in the acl, I used the source of everything rather than "10.2.5.0 0.0.0.255. This is because with 'all' the same acl could be applied to all the 10.2.x.x VLAN entering without any modification. You can if you want to be more specific to a specific acl for each vlan that is to say. for the same example above.

  extended IP access list

  deny ip 10.2.5.0 0.0.0.255 10.2.0.0 0.0.255.255

  IP 10.2.5.0 allow 0.0.0.255 any

  It would be more specific and would stop to any client no 10.2.5.x on this vlan to send packets, but most of communication would not work in all cases that the return should not would be routed packets properly to the customer.  But like I said this makes the unique acl to the vlan specific so you would need different ACLs by vlan.

  A few additional points-

  (1) if clients use DHCP and the DHCP server is a 10.2.x.x device that you need to allow that, before the line to deny

  (2) customers will not be able to ping to their default gateway, that is to say the interface vlan L3. This isn't a problem because the destination IP address is never usually the interface vlan L3, but if you want to be able to do you need an online permit before the line to refuse. Also note that this means that your acl would be different for each vlan, IP because of the vlan L3 is different by vlan

  (3) If you use the same real acl for each interface vlan all hits on the acl will be for all the VLANS so you will not be able to see visits by vlan. This may or may not be important to you. Often, this is why you see unique ACL (in terms of number or name but not necessarily input) use. If you do not want to see the visits by vlan and then simply to reproduce the acl, but with a new name by acl (assuming that you go with the ability to use 'everything' in your ACL).

  Hope all that makes sense. Doubts please ask for more.

  Jon

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• Catch 22 - Port Trunk Configurations: how to combine identifiers VLAN native with DHCP (but allows traffic of VM)

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  Context:

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  I am here, it's the side network.

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  So the Catch 22 question is as follows:

  If the id VLAN native set up on the switch port, DHCP works of course and the VMware boot loader is able to grasp a binary / packets on the network (FTP Site) and install OK.  But after no installation, no communication with SC unless I set the VLAN id of the SC to '0 '.  The value "4" 0 does not communication, but "40" is the VLAN native.

  If id configuring VLAN native retired from the Switch port, DHCP will not work and host does not have IP address during the VMware boot process.  This is as expected as traffic without label is not assigned an eligible

  VLAN, so no comms.

  The Port of the Switch configuration:

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  SERVERNAME description

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  switchport trunk vlan native 40

  switchport trunk allowed vlan 40-254

  switchport mode trunk

  switchport nonegotiate

  Speed 1000

  No cdp enable

  spanning tree portfast trunk

  end

  Summary

  OK, let's summarize where things are and if possible please attach responses to their digital identity.

  (1) is there a way to delete the VLAN tagging altogether side ESX host? Not only the id '0 '. The problem is with clearly with the VLAN native defined as "40".  If "40" IDs specified on the Group of ports for the Service Console, no joy, no comms. If the id of '0' value, capable of ping gateway and communicate on the network.

  (2) what is the problem with the definition of VLAN native as "40" when the config for the switch port is set as VLAN native "40"?  Or if it was a problem?  Both parameters clearly do not work together.

  (3) a switch receiving a unmarked frame it will assign to the VLAN Trunk native. Ok. Trunking bases and why I need a VLAN specified on the port for DHCP native work.  But it seems that since the id VLAN is set manually even as VLAN native, closed communications and no traffic as possible.

  (4) executives made tag 802. 1 q VLAN native?  I think that it is not and this could well be the problem. Since the id VLAN "40" is not labeled, but try to score the side host vSwitch port group.

  Please let me know your thoughts, community and how in general, we are approaching 2 NIC ESX configurations.

  When trunking multiple VLANs, you either have a default VLAN is nothing is tagged, or you don't.  That's what the vlan native to you, it defines which VLAN would be used if no tag is visible on the packets traversing the network.  For servers, if you are marking, then everything has to tag, if you're not marking at the server level, then the port must be either an access port or a VLAN native or default must be set.  I also don't keep your service console the same network as your vm.  Keep this isolated for the security of the network.  If you isolate this VLAN, you can separate and use a single IP address for installation and one for post construction.

  Or, you can provide an IP address during the build.

  -KjB

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