What is the difference between inbound and outbound access-list?
What is the difference between inbound and outbound access-list?
Inbound access lists are applied to packets coming into the interface. The inbound list is applied before other things such as routing descisions, crypto maps, route maps, etc. Outbound lists are applied to packets leaving the interface.
What is the difference between extended and standard access-list?
A “Standard” ACL allows you to prioritize traffic by the Source IP address. An “Extended” ACL provides greater control over what traffic is prioritized. Extended ACLs can use any or all of the following parameters: Destination IP address.
Are Cisco access lists stateful?
The reflexive access-list is the poor man’s stateful firewall. By default an access-list on a Cisco router doesn’t keep track of any connections. The only thing it cares about is whether an incoming packet matches a certain statement or not.
What are the different types of access control lists?
Types of Access Control Lists
- Standard ACL. An access-list that is developed solely using the source IP address.
- Extended ACL. An access-list that is widely used as it can differentiate IP traffic.
- ACLs everywhere. ACLs are enforced on each interface, in nearly all security or routing gear.
- ACL in order.
- Document your work.
What is named access list?
Named Access Control Lists (ACLs) allows standard and extended ACLs to be given names instead of numbers. Unlike in numbered Access Control Lists (ACLs), we can edit Named Access Control Lists. To create a Named Access Control List (ACL), we can use the following IOS command from Global Configuration mode.
Is ACL stateful?
A session ACL is a stateful firewall which keeps track of the state of network connections such as TCP streams and UDP communication that hit the firewall.
What does the access list command do in Cisco?
The access-list command is used to define a numbered ACL, meaning that the ACL will be identified in the configuration by its number. This number also designates the type of this ACL, i.e. standard IP, extended IP, MAC, etc. See here:
What’s the difference between IP Access Group in and out?
Re: ip access-group IN vs OUT. The difference in applying an ACL in or out is pretty easy. When you apply an ACL “in”, the router examines all traffic it RECEIVES on the interface against the ACL. When you apply an ACL “out” on an interface the router examines any traffic attempting to leave that interface against the ACL.
What’s the difference between’show IP access’and’show access list’?
‘Show ip access lists’ would filter out only the ip access lists, that is IPv4 access lists. If you ran ‘show access-lists’ you would have seen all access lists configured on the device. Today you will likely never see IPX or Apple Talk. They are older than dirt. So for IPv4 you can just run the shorter command.
How does an outbound access list work in Cisco?
Outbound —If the access list is outbound, after the software receives and routes a packet to the outbound interface, the software checks the criteria statements of the access list for a match. If the packet is permitted, the software transmits the packet. If the packet is denied, the software discards the packet.