hi, if all it's right on router. it's possible that there are vlans
setting on switch and the port System-1 and System-2 are in diffrent
vlans.
so I advisable you check the switch ports configurations as well as if
there is any filter iptables rule.
Em 8 de dezembro de 2011 17:59, Nikolay S. <nowhere@xxxxxxxxxxxxxxxx> escreveu:
> В Пт., 09/12/2011 в 00:00 +0530, anil dahiya пишет:
>> Hi ,
>>
>> I have following setup with routing table as shown below:
>>
>> +-----------------------+
>> | System-1 |
>> | "client" |
>> |------------------------|
>> | 192.168.11.5 |
>> +----------------------+
>> |
>> |
>> +------+-----+
>> | Switch +----------------------+
>> +------+-----+ |
>> | |
>> | +-------------------------+
>> | | 192.168.11.1 |
>> | |---------------------------|
>> | | Router |
>> | |-------------------------- |
>> | | 192.168.12.1 |
>> | +--------------------------+
>> | |
>> | |
>> +------------------------+ |
>> | 192.168.11.6 | |
>> |--------------------------| |
>> | System-2 | |
>> |--------------------------| |
>> | 192.168.12.6 | |
>> | |----------------+
>> +------------------------+
>>
>> Routing table details of setup
>> ------------------------------------------
>> System-1
>> -----
>> $route -n
>> Kernel IP routing table
>> Destination Gateway Genmask Flags Metric Ref Use Iface
>> 192.168.11.0 0.0.0.0 255.255.255.0 U 1 0 0 eth1
>> 0.0.0.0 192.168.11.1 0.0.0.0 UG 0 0 0 eth1
>>
>>
>> Router
>> -----------
>> $route -n
>> Kernel IP routing table
>> Destination Gateway Genmask Flags Metric Ref Use Iface
>> 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
>> 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
>>
>>
>> System-2
>> ------
>> $route -n
>> Kernel IP routing table
>> Destination Gateway Genmask Flags Metric Ref Use Iface
>> 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
>> 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
>> 0.0.0.0 192.168.12.1 0.0.0.0 UG 0 0 0 eth1
>>
>>
>> When I do ping from system-1 192.168.11.5 to system-2 192.168.12.6 ,
>> ping echo packet is reaching on system-2 through NIC 192.168.12.6 but
>> system is not sending any response to 192.168.11.5 using either of NIC
>> i.e 192.168.11.6 or 192.168.12.6 ? Why this is happening ? Can you
>> help me ?
>>
>> I have observed same type of symtoms when I do SSH from 192.168.11.5
>> to 192.168.12.6
>>
>> FYI,
>> ip_forwarding is enable on router and iptables are no configured on
>> any of system .
>
> I think, reverse path filtering is the problem here.
>
>>
>> Thanks,
>> Anil
>> --
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>
>
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