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How does "route add ..." fetch the interface automatically

This is a discussion on How does "route add ..." fetch the interface automatically within the Linux software forums, part of the Linux Getting Started category; Hi All, This is related to adding a default GW in the Kernal IP routing table in Linux. As you ...


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How does "route add ..." fetch the interface automatically How does "route add ..." fetch the interface automatically

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Old 02-21-2008, 11:32 AM
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Question How does "route add ..." fetch the interface automatically
Hi All,

This is related to adding a default GW in the Kernal IP routing table in Linux.

As you knt the Command to be used is :
route add default gw {ip address}

Note: I have not given the eth interface. My Question is, though the interface is not given, it automatically adds an interface by itself.

I would like to know the logic behind this. Is it taking this from any physical file or something..

The reason is the above command works fine in all my systems, except one, which takes the interface as lo which is not possible and wrong. so i have to explicitly specify bond0 as the itf.. (though, its not a prob..i wud like to know the root cause of this behaviour )

Kindly help.

Regards
Madhu
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Old 04-09-2008, 11:47 PM
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The route add command basically uses the gateway to determine which interface it will use.

an alternate method would to just send it directly to an interface
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Old 04-24-2008, 06:28 PM
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Default Try it
I think it depends on ethernet card in the system
try it
#ifconfig eth0 ipaddress
#route add default gw ip address eth0
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