Re: A PC with two NIC routing problem

root_at_vault2:~# cat /proc/sys/net/ipv4/conf/all/rp_filter
1
root_at_vault2:~# cat /proc/sys/net/ipv4/conf/eth0/rp_filter
1
root_at_vault2:~# cat /proc/sys/net/ipv4/conf/eth1/rp_filter
1
root_at_vault2:~#

On 10/01/2010 05:22 PM, Sergey Matashuk wrote:
> I guest there might be reverse path filtering applied on linux
> machine. Some linux distributions have it enabled by default.
>
> Can you show output of command "cat
> /proc/sys/net/ipv4/conf/all/rp_filter" and "cat
> /proc/sys/net/ipv4/conf/<INTERFACE_HERE>/rp_filter" from you linux
> box?
>
>
> On Fri, Oct 1, 2010 at 8:55 PM, Jack<ccie.unnumbered_at_gmail.com> wrote:
>
>> Yes, 10.10.10.1 and 11.11.11.1 respectively.
>>
>> On 10/01/2010 01:41 PM, Sergey Matashuk wrote:
>>
>>> do host10 and host11 have defult gateway configured?
>>>
>>> On Fri, Oct 1, 2010 at 8:32 PM, Jack<ccie.unnumbered_at_gmail.com> wrote:
>>>
>>>
>>>> A linux PC has two NIC cards:
>>>> eth0=10.10.10.100/24 belongs to VLAN 10
>>>> eth1=11.11.11.100/24 belongs to VLAN 11
>>>> the default gateway is 10.10.10.1
>>>>
>>>> A layer 3 switch has the following configuration:
>>>> int vlan 10
>>>> ip addr 10.10.10.1 255.255.255.0
>>>> int vlan 11
>>>> ip addr 11.11.11.1 255.255.255.0
>>>>
>>>>
>>>> Host10 on vlan 10 with ip address 10.10.10.10/24 can ping 10.10.10.100,
>>>> but
>>>> cannot ping 11.11.11.100
>>>>
>>>> Host11 on vlan 11 with ip address 11.11.11.11/24 can ping 11.11.11.100,
>>>> but
>>>> cannot ping 10.10.10.100
>>>>
>>>>
>>>> How to make the linux PC respond to all pings from both hosts?
>>>>
>>>>
>>>> Thanks,
>>>> Jack
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
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>>
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>>
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Received on Fri Oct 01 2010 - 18:40:26 ART