[CentOS] Configuring source-specific routing

[Rob Townley]

Somebody oughta try an external USB WiFi dongle on a laptop with internal
WiFi.  Does NetworkManager handle two WiFi devices?


On Sat, May 4, 2013 at 6:48 AM, Rob Townley <rob.townley at gmail.com> wrote:

> Find some businesses that both have open wifi near each other.  Bring an
> old WiFi router and a Cat5 cable.   Connect your laptop WiFi to one open
> hotspot.  Connect the old WiFi router in client access mode to another open
> wifi.  One "ISP" is to your local coffee shop.  The other "ISP" is to the
> grocery store.
>
>
> On Sat, May 4, 2013 at 6:33 AM, Rob Townley <rob.townley at gmail.com> wrote:
>
>> Any neighbors with Open WiFi?
>> Connect Cat5 to laptop in your house and connect to neighbors open WiFi.
>> Woila, two ISPs.
>>
>> If you have 3G, it will work better to connect it into a CradlePoint type
>> 3G hardware gateway device and connect the laptop to the 3G Gateway.
>> NetworkManager would only activate my bluetooth-to-3G connection when i
>> turned WiFi off.  (Further, i just ran `ip route` on my android phone while
>> connected to 3G and WiFi and the android output was disappointing.  Does
>> not have both active at same time.)
>>
>>
>> On Fri, May 3, 2013 at 8:37 PM, Michael Mol <mikemol at gmail.com> wrote:
>>
>>> On 05/03/2013 05:06 PM, Ljubomir Ljubojevic wrote:
>>> > On 05/02/2013 08:48 PM, Michael Mol wrote:
>>>
>>> [snip]
>>>
>>> >
>>> > Alternate source routing, firewall and netfilter marking of packets:
>>> >
>>> >
>>> > iptables -t mangle -A PREROUTING -s 172.24.5.0/24 -j MARK --set-mark
>>> 100 #
>>> > iptables -t mangle -A PREROUTING -s 192.168.150.107 -j MARK --set-mark
>>> > 200 #
>>> > iptables -t mangle -A PREROUTING -s 192.168.150.224 -j MARK --set-mark
>>> 100
>>> >
>>> >
>>> > # Local network
>>> > iptables -t mangle -A PREROUTING -d 192.168.0.0/16 -j MARK --set-mark
>>> 20
>>> > iptables -t mangle -A PREROUTING -d 172.16.0.0/12  -j MARK --set-mark
>>> 20
>>> > iptables -t mangle -A PREROUTING -s <PublicIP> -d 192.168.0.0/16 -j
>>> MARK
>>> > --set-mark 20
>>> > iptables -t mangle -A PREROUTING -s <PublicIP> -d 172.16.0.0/12 -j
>>> MARK
>>> > --set-mark 20
>>> >
>>> > And then something like:
>>> >
>>> > # echo 201 mail.out >> /etc/iproute2/rt_tables
>>> > # ip rule add fwmark 1 table mail.out
>>> > # /sbin/ip route add default via 195.96.98.253 dev eth0 table mail.out
>>> >
>>> > (http://lartc.org/howto/lartc.netfilter.html).
>>> >
>>> > Used firewall rules are from StarOS router OS that has simple script
>>> for
>>> > policy routing so that second part with ip rule and ip route is just a
>>> > pointer in right direction.
>>>
>>> I don't figure I want to use the mangle table for this. Though thanks
>>> for the example code; that will come in handy for tc. Just need how to
>>> work that in with sanewall.
>>>
>>> I think I know what I did wrong, but it's going to be a while before I
>>> can test it. (Dang, I wish I had enough spare hardware at home to set up
>>> a test lab.)
>>>
>>>
>>>
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>>>
>>>
>>
>