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:
>>>>>> 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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