[CentOS] Routing issue between 2 LANs

José María Terry Jiménez jtj at tssystems.net
Sun Dec 19 22:08:12 UTC 2010


Les Mikesell escribió:
> On 12/19/10 2:30 PM, Jose Maria Terry Jimenez wrote:
>   
>>>>>> This doesn't make much sense without a route.  Can you try a traceroute to the
>>>>>> fedora box address from the 192.168.236.80 box to see how/why it gets there

>>>>>> Hope it helps (all addresses are 192.168. Trimmed to compact the schema):
>>>>>>
>>>>>>
>>>>>> ----------      ----------     -----------
>>>>>> ! 1.3    !------!1.100   !     !gw 236.21!
>>>>>> ! gw 1.1 !   !  !  236.74!-----! 236.80  !
>>>>>> ----------   !  ! gw 1.1 !  !  -----------
>>>>>>                !  ----------  !
>>>>>>                !              !
>>>>>>            [Router1]       [Router2]
>>>>>>
>>>>>> Router 1 is a PFSense and its IP is 192.168.1.1
>>>>>> Router 2 is "something" (it is managed by other person, and i think is
>>>>>> somekind of win server) and IP is 192.168.236.21
>>>>>>
>>>>>>             
>
> This still doesn't explain why the 192.168.236.80 box can return packets to the 
> fedora at 192.168.1.3 when you said it didn't have a route going through 
> 192.168.236.74.   Can you check what routes you do have on 192.168.236.80 and 
> traceroute from there to 192.168.1.3?
>
>   
Apologies by confusing you. I forgot that "the other" CentOS had 2 NICs, 
this is the machine where i began these tests. It's in a remote site and 
now when listing the routes remembered that.

It's conected to the 1. network with a second NIC and IP: 192.168.1.102. 
Replies must be return by that iface, really?
[root at control ~]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 eth1
192.168.236.0   *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
default         192.168.236.21   0.0.0.0         UG    0      0        0 
eth0

I Configured a printer in the 236. network to use 192.168.236.74 as 
gateway and now i can access it from 1. Thanks.
[jose at IDi ~]$ ping 192.168.236.74
PING 192.168.236.74 (192.168.236.74) 56(84) bytes of data.
64 bytes from 192.168.236.74: icmp_req=1 ttl=64 time=0.276 ms
64 bytes from 192.168.236.74: icmp_req=2 ttl=64 time=0.245 ms

Thanks again

Best


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