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On Monday 26 November 2007, Dan Farrell wrote: |
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> you don't have to list the broadcast or netmask, if they can be |
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> guessed from context. In the case of using a 192.168.x/24 network |
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> they can generally both be guessed properly, because that's a Class C |
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> private address . |
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> |
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> However, in the case of 10.0.0/24, this may not be true. that is |
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> defined as class A private address space, and the networking utilities |
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> would probably assume it was 10.0.0/8, a netmask of 255.0.0.0 and a |
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> broadcast of 10.255.255.255. That is what ifconfig does at least: |
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> |
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> pascal ~ # ifconfig eth0:1 10.0.0.1 |
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> pascal ~ # ifconfig eth0:1 |
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> eth0:1 Link encap:Ethernet HWaddr 00:50:70:56:2E:CA |
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> inet addr:10.0.0.1 Bcast:10.255.255.255 Mask:255.0.0.0 |
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> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 |
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> Interrupt:225 Base address:0xc000 |
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That is what ifconfig does, if you don't specify a netmask: |
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[root@mozart /x]# ifconfig eth0:1 10.0.0.1 netmask 255.255.255.0 |
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[root@mozart /x]# ifconfig eth0:1 |
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eth0:1 Link encap:Ethernet HWaddr 00:11:2F:BB:F6:0D |
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inet addr:10.0.0.1 Bcast:10.0.0.255 Mask:255.255.255.0 |
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UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 |
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Interrupt:17 |
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I don't know exactly how initscripts work, but I suppose that if the /24 |
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is given in /etc/conf.d/net, then both the resulting iproute2 and |
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ifconfig command that bring the interface up will include the netmask |
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specification. |
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-- |
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