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system default route compared to default routes on each interface in redhat

Posted on 2013-12-31
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Last Modified: 2014-01-01
I have always worked in an environment where we set a system wide default gateway.

  when would you and why would you use gateways per interface ( like you would do if you fully populated the system-config-network-tui interface )

Redhat 5/6
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Question by:TIMFOX123
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by:TIMFOX123
ID: 39749292
Also what is the result of setting you dns per interface ?
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Duncan Roe earned 2000 total points
ID: 39749345
You can only usefully set one default route for 0.0.0.0 (0/0). If you set more than 1, the 1st one will always be used. But if, for instance, you have a network 10 VPN on the non-default interface, you might configure a different gateway for 10.0.0.0 (10/8). The VPN would have its own DNS, so you would configure a DNS in the 10/8 network as well as your regular DNS in network 0/0. Both DNS addresses would appear in /etc/resolv.conf and a gethostbyname() call would try both of them.
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Author Comment

by:TIMFOX123
ID: 39750000
great answer, I am going to keep this open for a little longer to see what else is posted.
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Author Closing Comment

by:TIMFOX123
ID: 39750353
thx
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