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GaryG
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PPP CHAP and OSPF authentication....

Fri Mar 02, 2012 9:45 am

Hi,

im wondering if OSPF authentication will work with PPP Chap. I cant seem to find anything to say whether or not that should be used together.

thanks,
G

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jdsilva
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Re: PPP CHAP and OSPF authentication....

Fri Mar 02, 2012 10:06 am

There's no direct relationship between the two. I'm not sure what you're asking.

If you mean can you run OSPF with authentication over a PPP link using CHAP, the answer is yes.

If you're asking can you authenticate OSPF using CHAP the answer is no.

GaryG
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Re: PPP CHAP and OSPF authentication....

Fri Mar 02, 2012 11:43 am

Thanks m8, just wanted to know if using the 2 would conflict with each other of if it was overkill using both.

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jdsilva
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Re: PPP CHAP and OSPF authentication....

Fri Mar 02, 2012 11:52 am

Nope, no conflict at all. You're fine to authenticate your PPP with CHAP and your OSPF with whatever at the same time.

Code: Select all
R5#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.1.3.3          0   FULL/  -        00:00:36    10.0.35.3       Serial0/1
R5#sh ip ospf int s0/1 | i auth
  Message digest authentication enabled
R5#sh ppp int s0/1 | i Auth
Se0/1 LCP:    AuthProto CHAP (0x0305C22305)
Se0/1 LCP:    AuthProto CHAP (0x0305C22305)
R5#sh run int s0/1
Building configuration...

Current configuration : 228 bytes
!
interface Serial0/1
 ip address 10.0.35.35 255.255.255.0
 encapsulation ppp
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 blah
 ip ospf 1 area 0
 ppp authentication chap
 serial restart-delay 0
end

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