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Why doesn't the firewall decrement the TTL of packets?

luisfelipermluisfeliperm Newbie ✭
in High End Firewalls

I would like to understand why the TTL (Time to Life) is not decremented by -1 when packets are forwarded through the firewall.

Devices that route must decrement a TTL value, but the firewall does not follow this rule when routing packets. I would like to understand if there is any reason for this behavior.


In Sonicwall there is an option in Firewall Settings -> Advanced -> Decrement TTL that is unchecked by default, if I activate it, the forwarded packets start to decrement the TTL.

Category: High End Firewalls
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Answers

  • ArkwrightArkwright Community Legend ✭✭✭✭✭

    I think it's supposed to be a security feature. If you don't decrement the TTL, you [hopefully] don't show up in a traceroute. I always enable it.

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