Cabletron Systems SSIM-R8-02 Specifikace stáhnout pdf (Strana 123)

Enterasys Xpedition User Reference Manual 103

Configuring IP Interfaces and Parameters

• DNS (port 37)

• NetBIOS Name Server (port 137)

• NetBIOS Datagram Server (port 138)

• TACACS Server (port 49)

• Time Service (port 37)

To forward UDP broadcast packets received on interface int1 to the host 10.1.4.5 for the six

default UDP services:

To forward UDP broadcast packets received on interface int2 to the host 10.2.48.8 for

packets with the destination port 111 (port mapper):

To forward UDP broadcast packets received on interface int3 to all other interfaces:

Configuring Direct Broadcast

Directed broadcast packets are network or subnet broadcast packets which are sent to a

router to be forwarded as broadcast packets. They can be misused to create Denial Of

Service attacks. The XP protects against this possibility by not forwarding directed

broadcasts, by default. To enable the forwarding of directed broadcasts, use the ip enable

directed-broadcast command.

You can configure the XP to forward all directed broadcast traffic from the local subnet to

a specified IP address or all associated IP addresses. This is a more efficient method than

defining only one local interface and remote IP address destination at a time with the ip-

helper command when you are forwarding traffic from more than one interface in the

local subnet to a remote destination IP address.

To enable directed broadcast forwarding on the “int4” network interface:

Configuring Denial of Service (DOS)

By default, the XP installs flows in the hardware so that packets sent as directed

broadcasts are dropped in hardware, if directed broadcast is not enabled on the interface

ssr(config)# ip helper-address interface int1 10.1.4.5

ssr(config)# ip helper-address interface int2 10.2.48.8 111

ssr(config)# ip helper-address interface int3 all-interfaces

ssr(config)# ip enable directed-broadcast interface int4

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Cabletron Systems SSIM-R8-02 Specifikace Strana 123