ODAP allows
importing DHCP settings using various methods, one of them being IPCP (Internet
Protocol Control Protocol for PPP). IPCP allows importing an IP address along
with the subnet mask (while PPP ignores the mask, DHCP can use it) as well as
DNS/WINS servers. This is useful in PPPoE deployments,
such as with DSL, where the DSL CPE router gets an address
assignmentthrough DHCP from the provider, and forwards options such as DNS to
the clients behind the CPE.To verify this check the DHCP pool settings
and verify the imported parameters
R2
- R3 encapsulation PPP. Config f0/0 R3 nhan dia chi ipaddress tu R2.
R2:
interface
Serial1/0
ip address 10.1.23.2 255.255.255.0
encapsulation ppp
no peer neighbor-route
peer default ip address 10.1.23.3
ppp ipcp mask 255.255.255.0
|
R3:
interface
Serial1/0
ip address negotiated
encapsulation ppp
no peer neighbor-route
ppp ipcp mask request
|
When
R3 receives RIP updates from R2 they are discarded because they are on
different networks. This is due to the fact that R3 uses the host route
10.1.23.3/32, and R2 is outside this range. To resolve this R3 must disable the
update source validation feature. Additionally the peer-neighbor-route
feature is disabled so that R3 does not inject R2’s IP address as a host
route into the routing domain.
Hoac
R3#show
run | se router rip
router
rip
version 2
no validate-update-source
network 0.0.0.0
no auto-summary
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