Questions tagged [ttl]
The ttl tag has no usage guidance.
10
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The TTL and packet drop [duplicate]
I would just like to verify one thing. When a router receives a packet with a TTL of 1, the router can still process and accept it if its destined for itself, correct? Because for example, eBGP ...
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3
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Accurate TTL calculation
I previously thought that TTL is a counter of hopes to device.
Today I learned that this is not so, but is connected with the processing time of packets.
Those maximum TTL = 255, equals the maximum ...
1
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1
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40
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ipsrc multicast group
I'm looking at some traces where a TTL exceeded in transit ICMP message with ipsrc as mcast is captured. The ICMP message is referencing the original ip header with a correct structure [ipsrc ucast, ...
- 11
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2
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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 ...
- 103
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3
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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
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1
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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 ...
- 11
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1
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24
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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 ...
- 101
-1
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3
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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 8.8.8.8 the TTL starts at 253 and doesn't change:
How can this be explained? Why ...
- 101
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2
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850
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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 ...
- 113
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In Bgp TTL security all control packets will have configured hop value?
Topology:
loop(2.1.1.1) - routerA (192.168.1.2)--------- (192.168.1.1) routerB - loop(1.1.1.1)
I have eBGP peering configured with a Multihop of 2 on both sides and static routes to reach loopbacks.
...
