Routing problems
Andrew Haley
aph at redhat.com
Thu Feb 18 11:29:42 UTC 2010
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 at redhat.com>
>> 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:
>>>> PING 172.17.1.50 (172.17.1.50) 56(84) bytes of data.
>>>> 64 bytes from 172.17.1.50: icmp_seq=1 ttl=253 time=5.62 ms
>>>> 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
>>>> 10.255.250.37 and then to its default GW dsl-router on eth0
>>>> instead of eth3 (so that the routing rule for 172.17.0.0 doesn't
>>
>>>> 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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