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Viewing Active Connections
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The appliances keep track of the connections going through them by placing connection information in a state/connection table, called a conn table Remember that the appliances are only stateful for TCP and UDP connections by default, but can also be stateful for ICMP The appliances allow traffic from a lower-level-security interface to a higherlevel one if there is a corresponding entry in the connection table An entry is placed in the connection table in two basic ways: A connection is added when a TCP or UDP connection is initiated from a higher-level interface to a lower one this allows the returning inbound traffic to the source A connection is added when inbound traffic is allowed by an ACL and a connection matches a permit statement this allows the returning outbound traffic to the source
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To see the connections in the connection table, use the show conn command:
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ciscoasa# show conn [detail] [count] [{foreign | local} IP_address_1[-IP_address_2]] [netmask subnet_mask] [protocol {tcp | udp | protocol]} [fport | lport port_1[-port_2]] [state state_information]
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Typing show conn by itself lists the entire state table Table 5-5 explains the rest of the parameters for this command An example of the output of the show conn command is shown here:
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ciscoasaa# show conn 6 in use, 6 most used TCP out 2022022021:80 TCP out 2022022021:80 TCP out 2022022021:80 TCP out 2022022021:80
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19216815:1404 19216815:1405 19216815:1406 19216815:1407
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0:00:00 0:00:00 0:00:01 0:00:01
Bytes Bytes Bytes Bytes
11391 3709 2685 2683
In this output, the internal host (in) 19216815 accessed an external web server (out) at 2022022021 An example of the output of the show conn detail command is shown here:
ciscoasa(config)# show conn detail 1 in use, 2 most used Flags: A - awaiting inside ACK to SYN, a - awaiting outside ACK to SYN, B - initial SYN from outside, D - DNS, d - dump, E - outside back connection, f - inside FIN, F - outside FIN, G - group, H - H323, I - inbound data, M - SMTP data,
5:
Address Translation
Parameter
detail count
Explanation Displays the translation type as well as the interfaces the connection traverses Displays only the number of connections in the table this can help you figure out if you have purchased the right connection license and/or security appliance Displays only the specified foreign or local addresses Displays only the specified IP protocol Displays translations for the specified foreign or local port number(s) Displays the connections by their state You can also limit the output of the display by specifying the state(s) that you are interested in
foreign | local protocol fport | lport state
Table 5-5 The Parameters for the show conn Command
O - outbound data, P - inside back connection, q - SQL*Net data, R - outside acknowledged FIN, R - UDP RPC, r - inside acknowledged FIN, S - awaiting inside SYN, s - awaiting outside SYN, U up TCP outside:20220220232/23 inside:192168110/1026 flags UIO
In this example, at the top of the display is a table explaining the flags that you may see at the end of a connection entry Below this table is a TCP telnet connection that was initiated by 192168110 (inside) to 20220220232 (outside) Its flags indicate that it is active and that it allows both inbound and outbound transfer of data
Viewing Local Host Information
Starting in version 70, you can view and clear the translations and connections of local hosts in one command: show local-host or clear local-host These commands allow you to view the conn and xlate entries for all hosts associated with an interface or interfaces, or a particular host, making it easier to understand what traffic is going through the appliance The full syntax of these commands is as follows:
ciscoasa# show local-host [IP_address] [detail] ciscoasa# clear local-host [IP_address] [all]
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