network routing.

Reindl Harald h.reindl at thelounge.net
Tue Mar 12 03:31:28 UTC 2013


> client hang on route command

what the hell are you doing?

the client does not need anything to know about routing
your router is the standard-gateway of the clients and
has to do anyhting with affeactes NAT/masquerading/routing
because that is why it is called router

Am 12.03.2013 04:20, schrieb Gary Artim:
> I tried postrouting/masquerade in iptables on the router and still the
> client hang on route command. Its like the client cant see the router.
> But ping works fine in both directions. If I try and ping a known
> address on the greater internet, nothing. So there is no route beyond
> the subnet of 192.168.0.0. I know its something dumb cause I've done
> this 10..12 times before and it aways worked or is working now on some
> servers.
> 
> On Mon, Mar 11, 2013 at 7:12 PM, Reindl Harald <h.reindl at thelounge.net> wrote:
>> you do NOT need this on the client.
>> and it is NOT enough if your machine works as NAT-router
>>
>> postrouting/masquerade is at least needed
>>
>> Chain POSTROUTING (policy ACCEPT 19602 packets, 1625K bytes)
>>  pkts bytes target     prot opt in     out     source               destination
>>    80  7964 MASQUERADE  all  --  *      eth1    192.168.2.0/24       0.0.0.0/0
>>
>> Chain FORWARD (policy DROP 0 packets, 0 bytes)
>>  pkts bytes target     prot opt in     out     source               destination
>>    48  2820 TCPMSS     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x06/0x02 TCPMSS
>> clamp to PMTU
>>     0     0 DROP       all  --  eth1   *       0.0.0.0/0            0.0.0.0/0            ctstate INVALID
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            ctstate NEW tcp dpt:0
>>     0     0 DROP       udp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            ctstate NEW udp dpt:0
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x3F/0x17
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x3F/0x01
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x3F/0x29
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x3F/0x3F
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x3F/0x37
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x3F/0x00
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x03/0x03
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x06/0x06
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x05/0x05
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x11/0x01
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x18/0x08
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:0x30/0x20
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            tcp flags:!0x17/0x02
>> ctstate NEW
>>     0     0 DROP       all  --  eth1   *       127.0.0.0/8          0.0.0.0/0
>>     0     0 DROP       tcp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            TTL match TTL < 5
>>     0     0 DROP       udp  --  eth1   *       0.0.0.0/0            0.0.0.0/0            TTL match TTL < 5
>>     0     0 DROP       all  --  eth1   *       84.113.45.179        0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       0.0.0.0/8            0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       10.0.0.0/8           0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       127.0.0.0/8          0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       169.254.0.0/16       0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       172.16.0.0/12        0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       192.0.0.0/24         0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       192.0.2.0/24         0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       192.88.99.0/24       0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       192.168.0.0/16       0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       198.18.0.0/15        0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       198.51.100.0/24      0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       203.0.113.0/24       0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       224.0.0.0/4          0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       240.0.0.0/4          0.0.0.0/0
>>     0     0 DROP       all  --  eth1   *       255.255.255.255      0.0.0.0/0
>>  8734 4397K ACCEPT     all  --  eth1   br0     0.0.0.0/0            192.168.2.0/24       ctstate RELATED,ESTABLISHED
>>  8698 3215K ACCEPT     all  --  br0    eth1    192.168.2.0/24       0.0.0.0/0
>>     4  2304 DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0
>>
>> Am 12.03.2013 03:07, schrieb Gary Artim:
>>> thanks, I forgot to mention I do have this set on both the client and
>>> router, still doesnt work. something is fishie, I went home frustrated
>>> and used my 2 laptops, one running mint linux, wirelessly, with a
>>> ethernet port (as the router) and one running fedora 18 as the client
>>> and got it to route -- ie ping yahoo.com. Go figure.
>>>
>>> On Mon, Mar 11, 2013 at 5:55 PM, zoom itman <rummymobile at gmail.com> wrote:
>>>> On Tue, Mar 12, 2013 at 10:25 AM, Gary Artim <gartim at gmail.com> wrote:
>>>>> I have a problems using a patch cable and trying to route though
>>>>> another machine
>>>>
>>>>
>>>> This might help, on the machine doing the forwarding:
>>>>
>>>> echo 1 > /proc/sys/net/ipv4/ip_forward
>>>>
>>>> Then, set net.ipv4.ip_forward to 1 in /etc/sysctl.conf so it persists
>>>> over reboots
>>
>>
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-- 

Reindl Harald
the lounge interactive design GmbH
A-1060 Vienna, Hofmühlgasse 17
CTO / CISO / Software-Development
p: +43 (1) 595 3999 33, m: +43 (676) 40 221 40
icq: 154546673, http://www.thelounge.net/

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