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Beginner

IPv6 OSPFv3- Blocks all Link-Local address

Hello team,

 

if i decided to secure IPv6 environment with traffic filters and blocks all link-local addresses. What will happen to OSPFv3?

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VIP Advisor

Re: IPv6 OSPFv3- Blocks all Link-Local address

How will you configure OSPF config for IPv6? are you going to configure interface level with neighbour link-local address right?

 

what is the requirement here to block link-local address?

 

Note: I may be misunderstood the question here.

 

 

 

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Beginner

Re: IPv6 OSPFv3- Blocks all Link-Local address

Hello Balaji.

 

the question is:

 

An engineer decided to secure IPv6 environment with traffic filters and blocks all link-local addresses. What will happen to OSPFv3?

 

from a CCNP Route 300-101

 

Best Regards

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VIP Advisor

Re: IPv6 OSPFv3- Blocks all Link-Local address

OSPF neighbor relationships  fails.

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Cisco Employee

Re: IPv6 OSPFv3- Blocks all Link-Local address

OSPFv3 needs link local connectivity in order to establish an adjacency. Without it, it will not come up.

 

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Cisco Employee

Re: IPv6 OSPFv3- Blocks all Link-Local address

If you block all link local then off course ospfv3 neighbors will go down. Since link local addresses are not routeable so I don’t really see any reasons to block it. No only ospfv3 but you will also block neighbor discovery packets which provides basic ipv6 functionality.

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