Questions tagged [ttl]

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IP packet expired by TTL generate an ICMP response in any case?

Acording to Wikipedia IPv4 article for TTL header field: An eight-bit time to live field limits a datagram's lifetime to prevent network failure in the event of a routing loop. It is specified in ...
1 vote
3 answers

How traceroute add TTL field to UDP header?

If the UDP packet's header is a fixed 8 bytes size, how it does not contain a field for TTL, How traceroute put that field ?
1 vote
1 answer

How are TCP segments discarded after Maximum Segment Lifetime expires?

From RFC 793: To be sure that a TCP does not create a segment that carries a sequence number which may be duplicated by an old segment remaining in the network, the TCP must keep quiet for a maximum ...
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1 answer

How to ensure packet was created within certain time?

I am creating a custom protocol over UDP and I want to use a low number of bits for the sequence number. This means that the number can wrap relatively fast. Is setting the TTL for the outgoing ...
-1 votes
3 answers

Confusion about TTL when pinging

TTL value of a packet is supposed to decrease 1 at each router from 255 down to zero as follows: But when I ping to the TTL starts at 253 and doesn't change: How can this be explained? Why ...
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2 answers

Is TCP's MSL value equivalent to IP's TTL value?

Definition of MSL according to RFC 793: Maximum Segment Lifetime, the time a TCP segment can exist in the internetwork system. Arbitrarily defined to be 2 minutes. Definition of TTL according to ...
1 vote
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In Bgp TTL security all control packets will have configured hop value?

Topology: loop( - routerA ( ( routerB - loop( I have eBGP peering configured with a Multihop of 2 on both sides and static routes to reach loopbacks. ...