Re: Destination Host Unreachable

Newsgroups	comp.os.linux.misc
Subject	Re: Destination Host Unreachable
References	<06GdnVinNqSX2KXJnZ2dnUU7-aWdnZ2d@giganews.com>
From	floyd@apaflo.com (Floyd L. Davidson)
Organization	__________
Date	2014-10-10 14:18 -0800
Message-ID	<87fvev36xl.fld@barrow.com> (permalink)

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finnmcmissile <viana.ronelo@yahoo.com> wrote:
>Hi
>
>I have two network cards.   One card is connected is LAN. Another one
>is connected to internet switch. Im using Fedora Core 5

Others are suggesting that IP forwarding be enabled, and
essentially you use this PC as a firewall for the others
on the LAN.

That certainly works, but isn't necessarily the only
useful topology.

I would put one of the very common 4-port routers
between that "internet switch" and your LAN.  If the LAN
is small, the 4 ports are all that is needed.  If it is
larger, use one or more Ethernet Switches to extend it.

I have a cable modem, connected to the WAN port on a 4 port
router.  There is a single 16 port gigabit Ethernet switch
to which all of my LAN devices, including the 4-port router,
are connected to.

The cable modem addreess is 192.168.1.100, the router is
192.168.0.3, and all devices on the LAN are 192.168.0.xxx.

Here is a typical route table for any LAN connected device:

  > route -n
  Kernel IP routing table
  Destination  Gateway      Genmask         Flags Iface
  0.0.0.0      192.168.0.3  0.0.0.0         UG    eth0
  127.0.0.0    0.0.0.0      255.0.0.0       U     lo
  192.168.0.0  0.0.0.0      255.255.255.0   U     eth0
  192.168.0.3  0.0.0.0      255.255.255.255 UH    eth0

This makes the router's builtin firewall functional for all
devices, rather than one of your PC's providing that function.

-- 
Floyd L. Davidson                         http://www.apaflo.com/
Ukpeagvik (Barrow, Alaska)                      floyd@apaflo.com

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Destination Host Unreachable finnmcmissile <viana.ronelo@yahoo.com> - 2014-10-10 15:43 -0500
  Re: Destination Host Unreachable The Natural Philosopher <tnp@invalid.invalid> - 2014-10-10 21:54 +0100
  Re: Destination Host Unreachable Andreas Kohlbach <oct14.5.ankman@spamgourmet.com> - 2014-10-10 17:00 -0400
  Re: Destination Host Unreachable floyd@apaflo.com (Floyd L. Davidson) - 2014-10-10 14:18 -0800

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