Routing problems

Andrew Haley aph at redhat.com
Thu Feb 18 12:06:22 UTC 2010


On 02/18/2010 11:56 AM, j.halifax . wrote:
>> Please post 
>> * Full details of your network
>> * The routing table, uncensored :)

Hmm, this is a remarkable plate of spaghetti.

I think the problem is probably the routing tables in the other boxes
in the same LAN (e.g. 10.255.250.38)

Andrew.


> route
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> 192.168.180.0 *                       255.255.255.0   U     0      0        0 eth3
> 10.200.1.0      10.255.250.250  255.255.255.0   UG    0      0        0 eth2
> 195.39.130.0    *                      255.255.255.0   U     0      0        0 eth0
> 10.1.1.0        10.255.250.250   255.255.255.0   UG    0      0        0 eth2
> 10.201.1.0      10.255.250.250  255.255.255.0   UG    0      0        0 eth2
> 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
> 192.168.0.0  192.168.180.100 255.255.0.0     UG    0      0        0 eth3
> default         pc89.n                0.0.0.0           UG    0      0        0 eth0
> 
> ifconfig 
> eth0      Link encap:Ethernet  HWaddr 00:1B:11:B1:5D:0D  
>           inet addr:195.39.130.92  Bcast:195.39.130.255  Mask:255.255.255.0
>           inet6 addr: fe80::21b:11ff:feb1:5d0d/64 Scope:Link
>           UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
>           RX packets:5174154 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:3474632 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:2851269308 (2.6 GiB)  TX bytes:646868735 (616.9 MiB)
>           Interrupt:21 Base address:0xca00 
> 
> eth2      Link encap:Ethernet  HWaddr 00:19:5B:38:B7:36  
>           inet addr:10.255.250.37  Bcast:10.255.250.255  Mask:255.255.255.0
>           inet6 addr: fe80::219:5bff:fe38:b736/64 Scope:Link
>           UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
>           RX packets:18187178 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2506338 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:1585335954 (1.4 GiB)  TX bytes:1901082841 (1.7 GiB)
>           Interrupt:22 Base address:0xa900 
> 
> eth3      Link encap:Ethernet  HWaddr 00:1B:11:B1:1C:D4  
>           inet addr:192.168.180.100  Bcast:192.168.180.255  Mask:255.255.255.0
>           inet6 addr: fe80::21b:11ff:feb1:1cd4/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:2048995 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:4746 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:201714109 (192.3 MiB)  TX bytes:364982 (356.4 KiB)
>           Interrupt:18 Base address:0x6800 
> 
> lo        Link encap:Local Loopback  
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:255570 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:255570 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:25105805 (23.9 MiB)  TX bytes:25105805 (23.9 MiB)
> 
> Thanx. :)
> 
> 
>> ------------ Povodní zpráva ------------
>> Od: Andrew Haley <aph at redhat.com>
>> PYedmt: Re: Routing problems
>> Datum: 18.2.2010 12:31:34
>> ----------------------------------------
>> 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
>>
>>>> ------------ Povodní zpráva ------------
>>>> Od: Andrew Haley <aph at redhat.com>
>>>> PYedmt: 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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>>>>
>>
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