From: Blaine Williams (williams.blaine@gmail.com)
Date: Sun Jun 24 2007 - 10:53:55 ART
Louis,
R1 needs to receive the syslog messages as broadcasts for the ip
helper-address command to work. Try logging to the directed broadcast
150.1.1.255 on R4. Don't forget to allow directed broadcasts on R1's
loopback. Then move your ip helper-address command from int Se0 to
Lo0. It has to be enabled on the interface receiving the broadcasts.
You shouldn't have to set the broadcast address on SW2. If everything
goes correctly, the syslog packets will be sent to the directed
broadcast 150.1.1.255 on R4. R1 will route it to it's Lo0 interface.
The ip directed-broadcast functionality will allow the directed
broadcast to be exploded to the physical broadcast 255.255.255.255.
With ip helper-address 192.168.1.101 on Lo0 and the ip
forward-protocol udp syslog, R1 will then take the physical broadcast
packet and unicast it to your syslog server. Of course, I haven't
tried this using loopbacks before, just the directly connected
interfaces.
Let us know if you get it working.
Blaine W.
On 6/21/07, louis john <west_coast@inbox.com> wrote:
> Hi All,
>
> I am trying to forward the syslog messages received by the serial interface of R1 to the syslog server connected to SW2, but I can not see any syslog messages on my server.R4 is forwarding the syslog messages to R1, that's why I configured the "logging 150.1.1.1" toward R1.
> the condition is to use the ip helper-address, so I can not configure the simple logging command toward the server.
>
> shouldn't the command ip helper-address forward the syslog messages to the address associated with it? maybe I am not able to do it because the syslog is reaching R1 an unicast, and the rule it must be all IP levle broadcast for the ip helper-address command to start work !
>
> if this is case then how I will convert the syslog traffic to be broadcast then !
>
>
>
>
>
> I will be thankful if you shed light on this issue
>
>
> R4----R1-----SW2---SYSLOG SERVER(192.168.1.101)
>
>
> R4
> logging 150.1.1.1
>
> R1
> inter loopback 0
> ip address 150.1.1.1
>
> interface Serial0
> ip helper-address 192.168.1.101
>
>
> ip forward-protocol udp syslog
>
> SW2
> interface fas1/0/48
> no switchport
> ip add 192.168.1.80 255.255.255.0
> ip broadcast-address 192.168.1.255
>
>
> Note: Reachability is done between all devices
>
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