IP Control Protocol
IPCP is specified in RFC 1332. IBM’s implementation supports the following
options:
vVan Jacobsen IPHeader Compression as described in RFC 1144.
vIP Address
The router can send its IP address, as well as accept an IP address, from a peer,
or supply an IP address to a peer, if requested. If the router is configured to
“Send Our Address” on a particular interface, and that interface has a valid,
numbered IP address, then IPCP sends the address in its initial
Configure-Request as option 3 (IP Address). IPCPalso sends its address if the
peer sends a Configure NAK with 0.0.0.0 for option 3 (IP Address), if a valid
numbered address is configured for that PPP interface. IPCP will not send an
unnumbered address to its peer.
A peer may specify its address (referred to as “Client Specified”), or request an
address from the router by sending 0.0.0.0 for Option 3 in its initial Configure
Request. The router may obtain this address from: the authenticated user profile
(referred to as “User ID”), the interface itself (referred to as “Interface”), or the
Dynamic Host Configuration Protocol (referred to as “Proxy DHCP”). Any one of
these four methods for specifying the peer’s IP address may be disabled or
enabled at the 2210 level. For more information on enabling and disabling these
items, see “Using a Dial-In Access to LANs (DIALs) Server” in the
Using and
Configuring Features
.
The router automatically adds a static route directed to the PPP interface for the
address that is successfully negotiated, allowing data to be routed properly to the
dial-in client. When the IPCP connection is ended for any reason, this static route
is subsequently removed. By default, the net mask for this route is
255.255.255.255 (hostroute); however, if a net mask is specified in the
authenticated user’s profile (see “Configuring PPP Authentication”on page 458) a
net mask other than this may be used to allow routing to more than a single host
across the PPP link (RIP or other routing protocols could also be used to
discover routes if desired).
IPv6 Control Protocol
IPv6 Control Protocol is specified in RFC 2023. In IBM’s implementation of IPv6CP,
the router can send its IP address, as well as accept an IP address, from a peer,or
supply an IP address to a peer, if requested. If the router is configured to “Send Our
Address” on a particular interface, and that interface has a valid, numbered IP
address, then IPv6CP sends the address in its initial Configure-Request as option 3
(IP Address). IPv6CPalso sends its address if the peer sends a Configure NAK
with ::/0 for option 3 (IP Address), if a valid numbered address is configured for that
PPP interface. IPv6CP will not send an unnumbered address to its peer.
A peer may specify its address (referred to as “Client Specified”), or request an
address from the router by sending ::/0 for Option 3 in its initial Configure Request.
The router may obtain this address from: the interface itself (referred to as
“Interface”) or the Dynamic Host Configuration Protocol (referred to as “Proxy
DHCP”). Any one of these methods for specifying the peer’s IP address may be
disabled or enabled at the 2210 level. For more information on enabling and
disabling these items, see “Using a Dial-In Access to LANs (DIALs) Server” in the
Using and Configuring Features
.
Using PPP
462 MRS V3.2 Software User’s Guide
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