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Title: ICMP TTL expired for multicast traffic?
Post by: sergeyrar on November 22, 2015, 07:20:45 AM

Is there such a thing?
Or Multicast traffic is dropped silently when hitting TTL=0?

Thanks:-)

Title: Re: ICMP TTL expired for multicast traffic?
Post by: srg on November 22, 2015, 12:34:23 PM

It's silently dropped as per RFC1112 (https://www.ietf.org/rfc/rfc1112.txt) section 7.2:

QuoteAn incoming datagram with an IP host group address in its source address field is
quietly discarded. An ICMP error message (Destination Unreachable, Time Exceeded,
Parameter Problem, Source Quench, or Redirect) is never generated in response to a
datagram destined to an IP host group.

Title: Re: ICMP TTL expired for multicast traffic?
Post by: Reggle on November 22, 2015, 03:59:54 PM

Always silently dropped. srg beat me with the RFC, I've come across it as well. If it wasn't, it would be an effective way to create DDoS attacks I think.

Title: Re: ICMP TTL expired for multicast traffic?
Post by: sergeyrar on November 23, 2015, 01:52:05 AM

Thanks:-)

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Professional Discussions => Routing and Switching => Topic started by: sergeyrar on November 22, 2015, 07:20:45 AM