Lantronix EDS2100, Руководство пользователя

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10: Service Settings
EDS1100/2100 Device Server User Guide 71
To find a DNS Name or IP Address:
1. Enter either a DNS name or an IP address in the field beside the Lookup button.
2. Click Lookup .
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When a DNS name is resolved, the results appear in the DNS cache.
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When an IP address is resolved, the results appear in a text below the Lookup field.
To clear cache entries:
1. Click Remove All to remove all listed cache entries.
2. Click Delete next to a specific cache entry to remove only that one.
Point-to-Point (PPP) Settings
Point-to-Point Protocol establishes a direct connection between two nodes. It defines a method for
data link connectivity between devices using physical layers (such as serial lines).
The EDS1100/2100 device server supports two types of PPP authentication: Password
Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). Both of
these authentication methods require the configuration of a username and password. The
EDS1100/2100 device server also supports the authentication scheme of “None” when no
authentication is required during link negotiation.
PAP authentication offers a straightforward method for the peer to determine its identity. Upon the
link establishment, the user ID and password are repeatedly sent to the authenticator until it is
acknowledged or the connection is terminated. However, PAP is not a strong authentication
process. There is no protection against trial-and-error attacks. The peer is responsible for the
frequency of the authentication communication attempts.
CHAP is a more secure method than PAP. It works by sending a challenge message to the
connection requestor. Using a one-way hash function, the requestor responds with its value. If the
value matches the server’s own calculations, authentication is provided. Otherwise, the connection
is terminated.
Note: RFC1334 defines both CHAP and PAP.
The EDS1100/2100 device server also supports authentication scheme of “None” when no
authentication is required during link negotiation.
Since the EDS1100/2100 unit does not support Network Address and Port Translation (NAPT),
static routing table entries must be added to the serial-side and network-side devices (both of
which are external devices).
Use the EDS1100/2100 Web Manager or CLI to configure a network link using PPP over a serial
line. Turn off Connect Mode, Accept Mode, and Command mode before enabling PPP. The
EDS1100/2100 device acts as the server side of the PPP link; it can require authentication and
assign an IP address to the peer. Upon PPP configuration, IP packets are routed between
Ethernet and PPP interfaces.
Note: The EDS1100/2100 device server does not perform network address translation
(NAT) between the serial-side network interface and the Ethernet/WLAN network
interface. Therefore, to pass packets through the EDS1100/2100 unit, a static route must
be configured on both the PPP Peer device and the remote device it wishes to
communicate with. The static route in the PPP Peer device must use the PPP Local IP