IPv6 header has Next Header to specify the extension headers but what can be the maximum limit of this? Ideally can I have as many number of extension headers as I want?

asked 19 Nov '11, 17:28

Fahad%20Ahmed's gravatar image

Fahad Ahmed
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Although there is nothing that explicitly states a limit of IPv6 Extension Headers, RFC2460 (the IPv6 RFC) only defines seven extension headers, and then goes on to state,

Each extension header should occur at most once, except for the Destination Options header which should occur at most twice.

So, putting these facts together, it seems to me that you'll never get more than eight extension headers in a legal IPv6 packet.

Of course, it is possible that an attacker trying to bypass access controls or perform a DDOS attack my create IPv6 packets with non-standard extension headers.

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answered 21 Nov '11, 10:29

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aid
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Asked: 19 Nov '11, 17:28

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Last updated: 01 Jul '13, 09:24

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