(Update) Turbo access lists

Hi all

Can someone tell me how to compiled access lists make the decision on how they segment lists access in first level lookup tables

I'm not looking for a doctoral thesis on how it works, but a general outline of how it decides and compiles.

concerning

Scott

Scott,

OK, c is always a foot 10 000 discovered here by reading the specifications made my brain hurt ;)

Essentially, what we do with Turbo ACL, is we take the internal game of access lists and build a set of data tables. Each ACE in the ACL Gets a value of 'index' are entrusted to him. This index value is calculated according to an algorithm that looks at the IP address source IP dest, Protocol, port L4, etc... When a package arrives in a PIX which configured ACL turbo, this same 'indexing' occurs and a value is determined. We then use this value which is calculated for the new package and compare it to the assigned values to the individual ACE in the data tables to find the ACE the new package to match and then to process packets accordingly.

This process of looking turned out be MUCH faster than the linear search standard, together with a linked list (normal) ACL.

In any case, it's more or less the bottom of it. Hope this helps to enlighten us.

Scott

Tags: Cisco Security

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    PS Please rate helpful messages.

  • Ipv6 access list does not apply autonomous Aironet 3602I-E

    As you can see in the attached config I configured two SSID (2G & 5 G) for a third (2G only) SSID and PEAP WPA2-Ent on the vlan 2 for 'poor team access as guest '.

    Basically I forced the Dot11Radio0.2 interface in the Group of deck 1 to get all three SSIDS on vlan 1 (since I want just a quick way and dirty to allow its customers access to the internet, without having to configure a vlan separate everywhere).

    The guest SSID (XX COMMENTS) allows tkip in addition to BSE and uses a PSK rather than PEAP. Access lists configured on Dot11Radio0.2 IPv4 allows clients connected to this SSID get an IP by DHCP, use the DNS servers on the local network and access the internet. All other traffic for the local network is blocked by access lists guest_ingress and guest_egress.

    This all works very well, ipv4 is blocked for guests invited as expected. However, ipv6 is something different. For some reason, the ipv6 access list is completely ignored.

    Because I don't need ipv6 for guest access, I thought that I have completely block and do with it. As you can see I have this set:

    interface Dot11Radio0.2
    guest_ingress6 filter IPv6 traffic in
    guest_egress6 filter IPv6 traffic on

    and these ipv6 access lists have a rule of "refuse a whole" only. Yet, the XX COMMENTS SSID connected client gets an ipv6 address of the server on the LAN DHCP6 and has full connectivity. For ipv4, that I had to explicitly allow DHCP packets to the client not even get an IP, so the ipv6 access lists are not clearly applied.

    No matter if I move the access interface Dot11Radio0 instead lists, they don't do anything. I thought that maybe I should add a "enable ipv6" on the Dot11Radio0.2 interface (even if ipv6 traffic was very good, even where it shouldn't), but when I set "enable ipv6" Dot11Radio0 or Dot11Radio0.2 the radio goes into a sort of infinite loop of reset:

    000261: Sep 23 2016 22:32:50.512 it IS: % DOT11-5-EXPECTED_RADIO_RESET: restart Radio Dot11Radio0 interface due to the reset of the interface
    000262: Sep 23 2016 22:32:50.516 it IS: % LINK-6-UPDOWN: Interface Dot11Radio0, changed State to down
    000263: Sep 23 2016 22:32:50.524 it IS: % LINK-5-CHANGED: Interface Dot11Radio0, changed State to reset
    000264: Sep 23 2016 22:32:51.516 it IS: % LINEPROTO-5-UPDOWN: Line protocol on the Interface Dot11Radio0, state change downstairs
    000265: Sep 23 2016 22:32:51.560 it IS: % LINK-6-UPDOWN: Interface Dot11Radio0, changed State to
    000266: Sep 23 2016 22:32:51.568 it IS: % LINK-6-UPDOWN: Interface Dot11Radio0, changed State to down
    000267: Sep 23 2016 22:32:51.576 it IS: % LINK-5-CHANGED: Interface Dot11Radio0, changed State to reset
    000268: Sep 23 2016 22:32:52.608 it IS: % LINK-6-UPDOWN: Interface Dot11Radio0, changed State to
    000269: Sep 23 2016 22:32:53.608 it IS: % LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed State to
    000270: 22:32:53.608 Sep 23, 2016 it IS: % DOT11-5-EXPECTED_RADIO_RESET: restart Radio Dot11Radio0 interface due to the reset of the interface
    000271: Sep 23 2016 22:32:53.612 it IS: % LINK-6-UPDOWN: Interface Dot11Radio0, changed State to down
    etc.

    In addition, when creating a list like this ipv6 access:

    guest_egress6 IPv6 access list
    refuse an entire ipv6

    The other is automatically created:

    IPv6-guest_egress6 role-based access list
    refuse an entire ipv6

    A deletion also removes the other.

    What is happening with these ipv6 ACLs, why they are not blocking all traffic? Why do I get an acl "role-based" too? Is associated it with?

    Is there a another way to kill just any ipv6 on the SSID of COMMENTS XX traffic while leaving alone on others? That's all I need at this stage. If the ipv6 ACL do not work, perhaps this can be done (ab) using a service-policy or policy routing? I'm ready to creative solutions :)

    PS. I know this is not the recommended method to configure a guest SSID, but it should still work IMO.

    You have encountered a bug I discovered a few months ago (CSCva17063), in your case, the workaround is to apply the ACL on the physical rather than the void interface interface (because you want to completely block IPv6 in any case). I write (more) my conclusions regarding the traffic that refusal on autonomous APs in a blogpost, might be interesting for you to read as well.

    Remember that the access point used as a bridge between the wired infrastructure and wireless, not as a router. There's some IOS routing of commands (like the "enable IPv6" command you pointed out) , but these are not the characteristics that should be used or need to be enabled on an access point.

    Because the networks internal and customer spend somewhere else, I would perform filtering on this device instead. Also sub gi0.2 interface is missing from your configuration, so I do not think that access as a guest is currently working at all?

    Please rate helpful messages... :-)

  • Access list ID # on a PIX firewall

    Is anyone know what of the identifier access list on a pix firewall?

    Standard IOS = 1-99

    Extended IOS is 100-199.

    SW = PIX?

    There is no "limit" by Word to say in the Pix. These limits are in IOS because they define what 'type' of acl, it's IE APPLETALK, IPX, IP etc etc. Pix IP is therefore not necessary for this type of identification.

    access-list 100000000000000; 1 items

    allow line of the access list 1 100000000000000 ip any a (hitcnt = 0)

    Jason

  • line 300 deny access-list

    Everyone;

    I need a few questions answered on how to condense on a 300 line refuse access-list into something maybe shorter. Right now, we want to put the abbreviated version of access on the border router 7204 VXR if possible list. It is an attempt to block possible known bad IP address that are not network friendly. Currently there are 2 ASA 5540 behind the border router.

    Thanks in advance;

    gmaurice

    No problem! Let us know if you have any other questions. Otherwise, please mark the thread as "answered" :)

  • Router Access List - where it is applied?

    I seem to be missing something here.  I have a 1841 router that has an access list configured and it actually loses packages based on this access list. I can't for the life of me see where this Access List is applied. Can anyone provide an overview?  Here is the result of the "Show Run":

    R - H1BR1 #sh run
    Building configuration...

    Current configuration: 3391 bytes
    !
    ! No change since the last restart configuration
    !
    version 12.4
    horodateurs service debug datetime msec
    Log service timestamps datetime msec
    no password encryption service
    !
    R-H1BR1 host name
    !
    boot-start-marker
    boot-end-marker
    !
    County of logging
    logging buffered 51200
    no console logging
    !
    No aaa new-model
    IP cef
    !
    !
    !
    !
    no ip domain search
    domain IP p911.positron name - psap.com
    name of the IP-server 10.4.0.1
    name of the IP-server 10.4.0.2
    name of the IP-server 10.5.0.3
    name of the IP-server 10.5.0.4
    IP multicast routing
    Authenticated MultiLink bundle-name Panel
    !
    !
    username * secret privilege 15 5 *.
    Archives
    The config log
    hidekeys
    !
    !
    TFTP IP source interface FastEthernet0/0.1
    !
    !
    !
    interface Tunnel5
    Description * TUNNEL to NODE B (Multicast only) *.
    IP 10.250.4.1 255.255.255.252
    IP pim-interval between queries 1
    origination-State pim IP 4 refresh rate
    PIM dense mode IP
    IP tcp adjust-mss 1436
    KeepAlive 1 6
    tunnel source 10.4.15.254
    tunnel destination 10.5.15.254
    !
    interface Tunnel25
    Description * TUNNEL at 25 SATELLITE (Multicast only) *.
    IP 10.250.25.1 255.255.255.252
    IP pim-interval between queries 1
    origination-State pim IP 4 refresh rate
    PIM dense mode IP
    IP tcp adjust-mss 1436
    KeepAlive 1 6
    tunnel source 10.4.15.254
    tunnel destination 10.25.15.254
    !
    interface FastEthernet0/0
    Description * to switch 1 last Port *.
    no ip address
    Speed 100
    full-duplex
    KeepAlive 1
    !
    interface FastEthernet0/0.1
    Description * BACKROOM LAN *.
    encapsulation dot1Q 1 native
    IP 10.4.15.253 255.255.240.0
    neighbor-filter IP pim DENY
    IP pim dr-priority 255
    IP pim-interval between queries 1
    origination-State pim IP 4 refresh rate
    PIM dense mode IP
    no ip mroute-cache
    KeepAlive 1
    45 minimum waiting time charge 60
    Watch 1 ip 10.4.15.254
    1 1 3 sleep timers
    1 standby preempt delay minimum charge 15 15 15 sync
    !
    interface FastEthernet0/1
    Description * BETWEEN R1 and R2 *.
    IP 10.252.204.1 255.255.255.252
    no ip proxy-arp
    IP-range of greeting 1 2604 eigrp
    IP - eigrp 2604 2 hold time
    no ip mroute-cache
    Speed 100
    full-duplex
    KeepAlive 1
    !
    interface FastEthernet0/0/0
    Description * WAN to H2 connection *.
    IP 172.16.215.246 255.255.255.0
    Speed 100
    full-duplex
    KeepAlive 1
    !
    interface FastEthernet0/0/1
    Description * connection to AAU *.
    IP 192.168.10.1 255.255.255.0
    Speed 100
    full-duplex
    KeepAlive 1
    45 minimum waiting time charge 60
    Watch 3 ip 192.168.10.3
    sleep timers 3 1 3
    3 standby preempt delay minimum charge 15 15 15 sync
    !
    Router eigrp 2604
    redistribute static
    passive-interface FastEthernet0/0.1
    passive-interface FastEthernet0/0/1
    10.4.0.0 network 0.0.15.255
    Network 10.252.0.0 0.0.255.255
    network 172.16.215.0 0.0.0.255
    No Auto-resume
    !
    IP forward-Protocol ND
    IP route 10.119.138.0 255.255.254.0 192.168.10.13
    IP route 10.121.1.0 255.255.255.0 192.168.10.13
    !
    !
    no ip address of the http server
    IP mroute 10.5.0.0 Tunnel5 255.255.240.0
    IP mroute 10.25.0.0 255.255.240.0 Tunnel25
    !
    standard IP DENY access list
    deny all
    !
    interface FastEthernet0/0.1 source journaling
    logging server-arp
    record 10.4.0.1
    !
    !
    control plan
    !
    !
    Line con 0
    local connection
    line to 0
    line vty 0 4
    exec-timeout 0 0
    local connection
    transport telnet entry
    line vty 5 15
    exec-timeout 0 0
    opening of session
    transport telnet entry
    !
    Scheduler allocate 20000 1000
    NTP-period clock 17177530
    NTP 10.4.0.1 Server
    end

    R H1BR1 #.

    I guess you are looking for

    interface FastEthernet0/0.1
    Description * BACKROOM LAN *.
    encapsulation dot1Q 1 native
    IP 10.4.15.253 255.255.240.0
     neighbor-filter IP pim DENY

    ?

    Best regards

    Milan

  • Cisco 837 and access list

    Hi all

    Sorry if my question sounds stupid, but I had a lot of problems with the syntax of the access list, especially to remove a line in an access list, for example:

    Here is my list of access

    access-list 120 allow ip 192.168.6.0 0.0.0.255 172.16.0.0 0.0.255.255

    access-list 120 allow ip 192.168.6.0 0.0.0.255 172.20.0.0 0.0.255.255

    access-list 120 allow ip 192.168.6.0 0.0.0.255 172.17.0.0 0.0.255.255

    If I want to delete only this line

    access-list 120 allow ip 192.168.6.0 0.0.0.255 172.16.0.0 0.0.255.255

    I do not know how, I if do:

    no access-list 120 allow ip 192.168.6.0 0.0.0.255 172.16.0.0 0.0.255.255

    all the access-list 120 is removed!

    Help, please!

    Olivier

    Hi, this is the usual behavior, if you delete the access list of the entire statement with sequence number is deleted.

    You can create a named extended access-list and have the sequence number for each statements.

    !

    Standard IP access list note

    permit 172.10.0.0 0.0.255.255

    10.1.1.0 permit 0.0.0.255

    permit 192.168.1.0 0.0.0.255

    deny all

    !

    and if you want to delete something in between, or any particular line, you can run the command like this that will remove this line instead of the entire ACL itself...

    Standard note of access-list (config) #ip

    (config-std-nacl) #no 3

    This configuration lines will remove the third line only (which is to allow the 192.168.1.0 0.0.0.255, leaving the other statements)

    regds

  • allow icmpv6 in ipv4-access list in the tunnel

    Hello

    I have a little problem with an access list ipv4 blocking my ipv6 tunnel.

    My tunnel works and is as follows:

    interface Tunnel0

    no ip address

    IPv6 address

    enable IPv6

    source of tunnel

    ipv6ip tunnel mode

    tunnel destination

    So when I apply the below, access list to the WAN interface on the sense IN, IPV6 stops working (everything works on IPV4 when the access list is applied). I mean, I cannot ping ipv6.google.com or ipv6.google.coms IP. I can still ping the IP ipv6 remote tunnel ().

    Access list that I apply is the following:

    allow tcp any a Workbench

    allowed UDP any eq field all

    allowed any EQ 67 udp no matter what eq 68

    allowed UDP any eq 123 everything

    allowed UDP any eq 3740 everything

    allowed UDP any eq 41 everything

    allowed UDP any eq 5072 everything

    allow icmp a whole

    deny ip any any newspaper

    Here are the requirements to the supplier of tunnel, and one of the entries is ICMPv6. Is it possible to allow icmp v6 on a Cisco access list?

    TCP 3874 TIC.sixxs.net IPv4 ICT (Information Tunnel & Control Protocol) Used to retrieve the information of tunnel (for instance AICCU) Uses the TCP protocol and should work without problems
    UDP 3740 PoP IPv4 Heartbeat Protocol Used for signalling where is the endpoint current IPv4 of the tunnel and he's alive the user only to pop out
    Protocol 41 PoP IPv4 IPv6 over IPv4 (6 in 4 tunnel) Used for tunneling IPv6 over IPv4 (static tunnels + heartbeat) We have to appoint the internal host as the DMZ host that leaves usually passes the NAT
    UDP 5072 PoP IPv4 AYIYA (anything in anything) Used for tunneling IPv6 over IPv4 (AYIYA tunnels) Must cross most NAT and even firewalls without any problem
    ICMPv6 echo response. Tunnel endpoints IPv6 Internet Control Message Protocol for IPv6 Used to test if a tunnel is alive in scathing tunnel endpoint (tunnel: 2) on the side PoP of the tunnel (tunnel: 1) on the tunnel No, because it is happening inside the tunnel

    I missed something?

    sidequestion: I added the "deny ip any any newspaper" in the access list, but it adds no registration entry in the log (show log). I'm sure it hits because when I run "display lists access": 110 deny ip any any newspaper (2210 matches).

    Hope someone can help me.

    Hello

    In the ACL above you are atleast specifying source and destination UDP and 41 SOURCE ports

    If you specify IPv6 over an IPv4 ACL I guess that the format would be to "allow 41 a whole" for example.

    Although I have barely touched IPv6 myself yet. Wouldn't it be possible to configure ACL Ipv4 and IPv6 ACL and attach them to the same interface?

    But looking at my own router it does not support these commands so that other devices to make. Maybe something related model/software I guess.

    -Jouni

  • Order of access-list syntax

    Hello

    I have a small question about the order in the syntax for an access list. I made my list of access work now, but I don't understand why.

    It looks like this when it did not work:

    (outside interface incoming traffic)

    access list 100 permit tcp any any established journal

    access-list 100 permit udp any any eq field journal

    access list 100 permit tcp any any eq field journal

    access-list 100 deny ip any any newspaper

    To make this work, I had to add these two lines:

    access-list 100 permit udp any eq field no matter what newspaper

    access list 100 permit tcp any eq field no matter what newspaper

    I do not understand the difference between

    access-list 100 permit udp any eq field all

    and

    access-list 100 permit udp any any eq field

    If you're wondering what the main goal with the list, it is to allow traffic from the inside to the outside and deny all other traffic, except the connections from the inside and the UDP traffic that is necessary because UDP doesn't have a domain.

    Hello

    Again, I think knowing that this 100 ACL is attached to the router's WAN interface in the direction 'in '. This means that its traffic control entering your network LAN.

    When we look at how DNS works now in what concerns this ACL

    • DNS lookup is usually made at the port of destination UDP/53
    • PC uses the random source for the DNS lookup port
    • Responses from DNS server for research with source UDP/53 port
    • Responses from DNS server to the computer on the port that the source PC search DNS

    So naturally you'll see responses from the host source and source UDP/53 port DNS

    If the ACL with the port of destination UDP/53 became all success, this would mean that you would host a DNS server and the DNS lookups were intended for your network.

    Also to your other question. If you set no ports using TCP/UDP in the ACL then he accepts any source/destination port

    Hope this helps

    Be sure to mark it as answered in the affirmative.

    -Jouni

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