Re: Routing problems

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On 02/18/2010 11:19 AM, j.halifax . wrote:
>> What is the address of the subnet "other LAN" ?
>> There seem to be two more subnets, 192.168.180.0 and 172.17.0.0.
> You are right, both of them are accessible through eth3 and the same 
> box of 192.168.180.100 (I didn't include the whole routing table) like:
> 172.17.0.0    192.168.180.100  255.255.0.0    UG   0    0    0  eth3
> 192.168.0.0  192.168.180.100  255.255.0.0    UG   0    0    0  eth3.

Please post

* Full details of your network
* The routing table, uncensored

>> ------------ Původní zpráva ------------
>> Od: Andrew Haley <aph@xxxxxxxxxx>
>> Předmět: Re: Routing problems
>> Datum: 18.2.2010 11:51:17
>> ----------------------------------------
>> On 02/18/2010 10:01 AM, Rick Sewill wrote:
>>> On Thu, 2010-02-18 at 07:31 +0100, j.halifax . wrote: 
>>>> Hi All,
>>>>
>>>> Could you please help me with routing in the LAN default GW box?
>>>>
>>>> I have 
>>>> eth0 connected to Internet 
>>>> eth2 to internal LAN 10.255.250.0 
>>>> LAN default GW is 10.255.250.37
>>>> eth3 connected to other LAN
>>
>> What is the address of the subnet "other LAN" ?
>>
>> There seem to be two more subnets, 192.168.180.0 and 172.17.0.0.
>>
>> Andrew.
>>
>>
>>
>>>> Route in the default GW (10.255.250.37):
>>>>
>>>> Destination       Gateway           Genmask         Flags Metric Ref  Use
>> Iface
>>>> 192.168.180.0   *                       255.255.255.0   U      0      0      
>>  0  eth3
>>>> 10.255.250.0     *                       255.255.255.0   U      0      0     
>>   0  eth2
>>>> link-local           *                       255.255.0.0      U     1003   0 
>>       0  eth0
>>>> link-local           *                       255.255.0.0      U     1004   0 
>>       0  eth2
>>>> link-local           *                       255.255.0.0      U     1005   0 
>>       0  eth3
>>>> 172.17.0.0       192.168.180.100  255.255.0.0      UG    0      0        0 
>> eth3
>>>> default             dsl-router            0.0.0.0             UG    0      0 
>>       0  eth0
>>>>
>>>> >From the LAN default GW (10.255.250.37) 
>>>> - I can ping 172.17.1.50:
>>>> &nbsp;&nbsp;PING 172.17.1.50 (172.17.1.50) 56(84) bytes of data.
>>>> &nbsp;&nbsp;64 bytes from 172.17.1.50: icmp_seq=1 ttl=253 time=5.62 ms
>>>> &nbsp;&nbsp;64 bytes from 172.17.1.50: icmp_seq=2 ttl=253 time=3.29 ms
>>>>
>>>> >From other boxes in the same LAN (e.g. 10.255.250.38)
>>>> - I cann't ping 172.17.1.50
>>>> - I cann't traceroute 172.17.1.50: It goes to LAN default GW 
>>>> &nbsp;&nbsp;10.255.250.37 and then to its default GW dsl-router on eth0
>>>> &nbsp;&nbsp;instead of eth3 (so that the routing rule for 172.17.0.0 doesn't
>>
>>>> &nbsp;&nbsp;match for 172.17.1.50)
>>>>
>>>> Can anybody help pleasee?
>>>> Thank you so much!
>>>> jh
>>>>
>>>
>>> Your problem has me stumped.
>>>
>>> The only thing I can think of is to ask how iptables is set up.
>>>
>>> I think you have iptables doing masquerading to the eth0 interface.
>>> The masquerading shouldn't be the problem.
>>>
>>> Are you doing anything special with packets coming in eth2 in iptables?
>>>
>>> I assume 10.255.250.38 can ping the Internet so you have routing set up.
>>>
>>> I can't think of anything else to check at this moment.
>>>
>>> Hopefully others will have better suggestions and ideas where to look.
>>>
>>>
>>>
>>
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