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Re: Sending ICMP echo request out

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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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