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Obviously, using time-based access lists depends on the router having the correct time Cisco routers can use the NTP to synchronize their clocks to a dependable time source Here's a simple example of the use of NTP: clock timezone PST -8 clock summer-time PDT recurring ntp update-calendar ntp server 1611011 interface ethernet 0 ntp broadcast We could specify that a router has the authoritative clock through the use of the command ntp master More coverage of NTP is beyond the scope of this book The NTP protocol and its use in a Cisco router network is covered in detail in documents on the Cisco Web site at http://wwwciscocom
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Reflexive access lists were introduced in IOS Version 113 and are available on all router platforms Reflexive access lists provide a way to maintain information about the state of existing connections Recall our earlier discussion in 6, "Cisco Router Access Lists," about the difference between stateful and stateless packet filtering Also recall that traditional access lists have no method for determining whether a packet is part of an existing connection Reflexive access lists provide an enhanced method to remedy this shortcoming by creating dynamic, temporary openings in an access list similar to dynamic access lists A reflexive access list is triggered when a new IP traffic session is initiated from inside your network to an external network The reflexive access list generates a new, temporary opening The new entry permits traffic to enter the network if the traffic is part of the original session The temporary entry created has the following characteristics:
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The entry is always a permit entry The entry specifies the same protocol as the original outbound packet (ie, TCP, UDP, ICMP, or IP) The new entry swaps the source and destination IP addresses The new entry swaps the source and destination upper-layer port numbers (for ICMP, type numbers are used) The entry exists until either the session is closed or the idle timeout is reached Only TCP conversations will be actively closed through the monitoring of FIN or RST bits in incoming packets Other protocols such as UDP must reach the idle timeout Essentially, reflexive access lists create "mirror image" or "reflected" entries in an existing access list, and these entries enable packets which are part of an existing connection to pass through the access list For example, suppose a user initiated an outbound Telnet session from IP address 160101100 to IP address 175100101 using source TCP port number 1045 The original outbound packet has the following characteristics: Source IP address: 160101100 Source TCP port: 1045 Destination IP address: 175100101 Destination TCP port: 23 (Telnet) Reflexive access lists would create a "reflected" access list entry enabling inbound return traffic: permit tcp 175100101 eq 23 160101100 eq 1045 Notice that this entry is a mirror image of the outbound packets The source and destination IP addresses and the source and destination port numbers have been exchanged This entry is the reverse image of the original outgoing packets, as if the original packets were viewed in the reflection of a mirror
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Reflexive access lists are powerful, but they suffer from one major drawback Many protocols do not use a simple, one data, "channel" connection In this context, "channel" means a single, fixed port number For example, as we saw in 6, FTP uses multiple source ports during a conversation FTP also relies on the server's capacity to initiate a connection to the originating host
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Reflexive access lists do not account for this property of some applications and are therefore not capable of handling them As a rule of thumb, reflexive access lists are only capable of handling single channel applications These are applications that only use a single, static port that does not change over the duration of the conversation Many applications that use multiple port numbers, or "channels," rely on the capability of the server to actively establish a connection with the originating client NoteThis feature, and not the use of multiple ports per se, precludes their use with reflexive access lists If multiple outgoing connections were necessary, reflexive access lists would just generate multiple "reflected" entries For example, there is a version of the FTP protocol called passive mode FTP (PASV) In this mode, the server does not perform an active open to the originating client Instead, the client exchanges port information over the traditional command channel and then performs an additional open to the server on an agreed upon port In this case, because both sessions are outbound from the client, reflexive access lists would simply create an additional "reflected" entry, and the data conversation would succeed
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