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TOPIC: Recursive table lookup

Recursive table lookup 11 years 10 months ago #7230

  • Apostolis
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Hello!

Does anyone know what is recursive table lookup? Why use it?

Is it a way that static routing works? Can you give me an example?

Thank you
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Re: Recursive table lookup 11 years 9 months ago #7263

  • Apostolis
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Anyone? I really need some help! :wink:
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Re: Recursive table lookup 11 years 9 months ago #7264

  • nske
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It must be the procedure that a router follows to determine how to route packets with a specific destination (other than one in the subnets of it's itnerfaces).

i.e. a packet arrives at the router with destination address 10.14.142.20, the router has no interface to a subnet containing 10.14.142.20, so it first checks for an entry at the routing table refering to the appropriate subnet, i.e. 10.14.142.0/24. It may find an entry such as:

[code:1]
Destination Gateway Genmask Flags Metric Ref Use Iface

10.14.142.0 10.2.13.150 255.255.255.0 UG 0 0 0 eth4[/code:1]

So it will go back and check how it can contact 10.2.13.150. It will find an entry such as:

[code:1]
Destination Gateway Genmask Flags Metric Ref Use Iface
10.2.13.144 * 255.255.255.248 U 0 0 0 eth4
[/code:1]

So it knows it can contact 10.2.13.150 through the local interface eth4.

That's a simple example of recursion.
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Re: Recursive table lookup 11 years 9 months ago #7273

  • Apostolis
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nske, thank you for your explenation!!

Να 'σαι καλά,
Αποστόλης :wink:
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Re: Recursive table lookup 11 years 9 months ago #7275

  • nske
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hehe it's especially nice to see people from the same place in a serious international community!

Hope you'll stay arround :)
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