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Operating Systems Linux Red Hat How to set static routes for packets, within the same Network? Post 302994981 by bakunin on Thursday 30th of March 2017 07:41:35 AM
Old 03-30-2017
It looks as the three hosts are on the same subnet. In this case you cannot use "static routes" because any route - static or else - just defines a way to get from one subnet to another, not to get somewhere on the same subnet.

You may want to define a "proxy" server, but you will have to install additional software (which one depends on which protocols you want to be affected by the proxy) on at least the B-server where you want to route the traffic through.

Another possibility is to put the systems on different subnets: A goes to one subnet, C goes to another subnet and B has one interface in in both these networks AND has "IP-forwarding" enabled. This way you can enforce all packets between A and C to go through B and - using a firewall software, you can even apply additional rules for which packets to allow and which to drop (forbid).

I hope this helps.

bakunin
 

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ROUTE.CONF(5)						      BSD File Formats Manual						     ROUTE.CONF(5)

NAME
route.conf -- static routes config file DESCRIPTION
The route.conf file is read by the staticroute rc.d script during system start-up and shutdown, and is intended for adding and removing static routes. FILE FORMAT Lines starting with a hash ('#') are comments and ignored. Lines starting with a plus sign ('+') are run during start-up, while lines start- ing with a minus sign ('-') are run during system shutdown. If a line starts with a '!', the rest of the line will get evaluated as a shell script fragment. All other lines are passed to route(8). During start-up, they are passed behind a ``route add -'' command and during shut- down behind a ``route delete -'' command. FILES
/etc/route.conf The route.conf file resides in /etc. /etc/rc.d/staticroute rc.d(8) script that parses route.conf. EXAMPLES
In this example, the interface for the desired routing changes is set, the IP address on that interface is determined, and a route is added during startup, or deleted during system shutdown. # Set interface and determine current IP address for added route. !ifname=bnx0 !ipaddr=$(/sbin/ifconfig ${ifname} | awk '$1 == "inet" {print $2}') net 10.10.1 -interface ${ipaddr} In this example, IP forwarding is turned on during start-up, and a static route added for 192.168.2.0. During system shutdown, the route is removed and IP forwarding turned off. # Turn on/off IP forwarding. +sysctl -w net.inet.ip.forwarding=1 -sysctl -w net.inet.ip.forwarding=0 net 192.168.2.0 -netmask 255.255.255.0 192.168.150.2 SEE ALSO
rc.conf(5), rc(8), route(8) BSD
May 1, 2012 BSD
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