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IP Traffic forwarding
Post 302344622 by Anuradhai4i on Monday 17th of August 2009 07:01:48 AM
08-17-2009
IP Traffic forwarding
Hello All
I have the following setup of a network. Client machines sends requests to the server which is (192.168.1.50) running on Ubuntu server 8.04. And this server forwards all incoming traffic from clients to another server (192.168.1.100) when it's available. The availability is checked periodically using a shell script.
The following NAT rule has been given for the forwarding task.
Rule 1: Iptables -t nat -A PREROUTING -d 192.168.1.50 -j DNAT --to-destination 192.168.1.100
In the event 192.168.1.100 is unavailable the shell script will detect the unavailability and shift the traffic to 192.168.1.200. The current iptable rules are flushed and the following rule is applied.
Rule 2: Iptables -t nat -A PREROUTING -d 192.168.1.50 -j DNAT --to-destination 192.168.1.200
In the normal scenario when 192.168.1.100 is available the forwarding rule (Rule 1) works properly. The issue is when 192.168.1.100 is unavailable and the traffic is shifted to 192.168.1.200 the traffic is not forwarded properly as required. However when 192.168.1.50 is rebooted and Rule 2 is applied the
forwarding happened as required.
ARP cache and router cache was cleared as well but that did not
solve the issue. The issue was solved only after rebooting 192.168.1.50
Any idea that I can get this sone without rebooting 192.168.1.50 ?
Thank you in advance
Anuradha
I have the following setup of a network. Client machines sends requests to the server which is (192.168.1.50) running on Ubuntu server 8.04. And this server forwards all incoming traffic from clients to another server (192.168.1.100) when it's available. The availability is checked periodically using a shell script.
The following NAT rule has been given for the forwarding task.
Rule 1: Iptables -t nat -A PREROUTING -d 192.168.1.50 -j DNAT --to-destination 192.168.1.100
In the event 192.168.1.100 is unavailable the shell script will detect the unavailability and shift the traffic to 192.168.1.200. The current iptable rules are flushed and the following rule is applied.
Rule 2: Iptables -t nat -A PREROUTING -d 192.168.1.50 -j DNAT --to-destination 192.168.1.200
In the normal scenario when 192.168.1.100 is available the forwarding rule (Rule 1) works properly. The issue is when 192.168.1.100 is unavailable and the traffic is shifted to 192.168.1.200 the traffic is not forwarded properly as required. However when 192.168.1.50 is rebooted and Rule 2 is applied the
forwarding happened as required.
ARP cache and router cache was cleared as well but that did not
solve the issue. The issue was solved only after rebooting 192.168.1.50
Any idea that I can get this sone without rebooting 192.168.1.50 ?
Thank you in advance
Anuradha
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LEARN ABOUT CENTOS
aggregate-ios
AGGREGATE-IOS(1) General Commands Manual AGGREGATE-IOS(1) NAME
aggregate-ios - optimise a concatenated set of cisco/IOS prefix filters to help make them nice and short. SYNOPSIS
aggregate-ios <source_config >optimised_config DESCRIPTION
Takes cisco IOS configuration on stdin, and optimises any prefix filters found using aggregate(1). Optimised filters are produced on std- out. OPTIONS
None. DIAGNOSTICS
Any diagnostics produced by aggregate(1) are passed through on stderr. EXAMPLES
The following configuration fragment: ip prefix-list AS65530 description Foo, Inc ip prefix-list AS65530 permit 10.1.0.0/16 ip prefix-list AS65530 permit 10.2.0.0/16 ip prefix-list AS65530 permit 10.2.1.0/24 ip prefix-list AS65530 permit 10.3.0.0/16 ip prefix-list AS65531 description Bar.Com ip prefix-list AS65531 seq 5 permit 192.168.1.0/24 ip prefix-list AS65531 seq 10 permit 192.168.2.0/24 ip prefix-list AS65531 seq 15 permit 192.168.0.0/19 is optimised as follows: ip prefix-list AS65530 permit 10.1.0.0/16 le 24 ip prefix-list AS65530 permit 10.2.0.0/15 le 24 ip prefix-list AS65531 permit 192.168.0.0/19 le 24 SEE ALSO
aggregate(1) HISTORY
Aggregate-ios was written by Joe Abley <jabley@mfnx.net>. BUGS
All those in aggregate(1) and then some :) Joe Abley 2000 November 27 AGGREGATE-IOS(1)