Allied Telesis Switch AT-S110 Uživatelský manuál stáhnout pdf (Strana 292)

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Chapter 23: DHCP Snooping

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A network device initially sends out a DHCPDISCOVER packet so that a

DHCP server will respond. It waits for and then accepts the

first DHCPOFFER packet from the server that it receives. This packet

contains the DHCP server’s IP address and mask. If the unauthorized

DHCP server responds first, then the network device will use the

information from the unintended DHCP server for the default gateway or

DNS server.

Untrusted ports are connected to the DHCP clients and to traffic that

originated outside the LAN. By definition, untrusted ports do not accept

DHCP packets originating form a DHCP server and immediately drop

them when they are detected. The DHCP packets types that are not

accepted are DHCPOFFER and DHCPACK.

However, untrusted ports do accept both DHCP DISCOVER and

DHCPREQUEST packets sent from DHCP clients. This behavior

allows DHCP clients to respond to a trusted DHCP server and not respond

to a DHCP server that is untrusted.

DHCP with

Option 82

You can configure the AT-GS950/10PS to pass DHCP packets containing

Option 82 information through the switch without altering the information

within the packet. You can also configure the AT-GS950/10PS switch to

insert DHCP Option 82 information directly into the DHCP packets as they

pass through the switch.

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