Cisco 700 series Overzicht - Pagina 4

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Product Features

NetBIOS Over TCP/IP Packet Filter

A generic ﬁlter capability on the Transaction Control Protocol/User Datagram Protocol

(TCP/UDP) packets allows users to ﬁlter NetBIOS packets generated by application

programs. Use the set ip ﬁlter command to control this feature.

NetBIOS Name Spooﬁng

When a WINS client sends out a NetBIOS Name query, the router can answer a NetBIOS

name query in place of the WINS server. If the router cannot answer, the router forwards

the query packets to the server, which forwards the response to the client. If spooﬁng is set,

the router keeps a local database of up to 100 Domain Name System (DNS) name entries

and has an aging scheme to age out the unused name entries.

Automatic Conﬁguration From BOOTP

The automatic conﬁguration feature allows the Cisco 700 series router to obtain a

conﬁguration ﬁle from a remote server using BOOTP protocol. Upon power-up, the router

examines the Auto_Conﬁg ﬂag stored in NVRAM. If the Auto_Conﬁg ﬂag is FALSE, the

router initiates a BOOTP request for an IP address from the BOOTP server. If the BOOTP

server ﬁnds a matching MAC address, the server returns an IP address and a conﬁguration

ﬁle name. The router initiates TFTP to download a conﬁguration ﬁle.

After successfully loading the conﬁguration ﬁle, the router sets the Auto_Conﬁg ﬂag to

TRUE in NVRAM. In subsequence power-up operations, if the Auto_Conﬁg is TRUE, the

router does not initiate BOOTP. The set default command resets the Auto_Conﬁg ﬂag to

FALSE.

The automatic conﬁguration feature only works on the Ethernet interface. If the router does

not receive a BOOTP response from the server within 5 seconds of the ﬁrst BOOTP request,

the router gives up and the Internet Protocol (IP) information must be conﬁgured manually.

DHCP automates IP addressing and reduces the number of IP addresses a site might

require. Cisco 700 series routers can function as a dynamic host conﬁguration protocol

(DHCP) server. (The router can also act as a DHCP relay, but not both at the same time.)

1-4 Cisco 700 Series Router Installation Guide