Hello,
I've been working on this for over a week. I don't think its working the
way
it should.
Here's what I'm trying to do:
I have a Windstream dsl router with wireless > 192.168.1.100
|
|
Centos 6.8 server eth0 > 192.168.1.110 > gateway 192.168.1.111
eth1 > 192.168.1.111 > gateway
192.168.1.100
|
|
Switch > other computers and devices > gateway 192.168.1.110
I want to send all internal traffic through 192.168.1.110, all external
traffic through 192.168.1.111, then back through 192.168.1.110.
I did an iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
Issues:
Outside connectivity for all other computers and devices only works if eth0
is also connected to the router, server works
Iptraf shows no traffic on eth1
Hope I haven't confused you as I have thoroughly confused myself.
TIA
TE Dukes
> -----Original Message----- > From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On > Behalf Of TE Dukes > Sent: Saturday, September 3, 2016 7:31 AM > To: 'CentOS mailing list' > Subject: [CentOS] Networking/routing issue > > Hello, > > I've been working on this for over a week. I don't think its working theway it> should. > > Here's what I'm trying to do: > > I have a Windstream dsl router with wireless > 192.168.1.100 > | > | > Centos 6.8 server eth0 > 192.168.1.110 > gateway 192.168.1.111 > eth1 > 192.168.1.111 > gateway > 192.168.1.100 > | > | > Switch > other computers and devices > gateway 192.168.1.110 > > I want to send all internal traffic through 192.168.1.110, all externaltraffic> through 192.168.1.111, then back through 192.168.1.110. >[Thomas E Dukes] The above needs a little clarification: all external traffic through 192.168.1.111 > 192.168.1.110> all other computers and devices.> I did an iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE > > Issues: > > Outside connectivity for all other computers and devices only works ifeth0 is> also connected to the router, server works Iptraf shows no traffic on eth1 > > Hope I haven't confused you as I have thoroughly confused myself. > > TIA > > TE Dukes > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos
On 09/03/2016 01:31 PM, TE Dukes wrote:> Centos 6.8 server eth0 > 192.168.1.110 > gateway 192.168.1.111 > eth1 > 192.168.1.111 > gateway > 192.168.1.100 > | > | > Switch > other computers and devices > gateway 192.168.1.110 > > I want to send all internal traffic through 192.168.1.110, all external > traffic through 192.168.1.111, then back through 192.168.1.110.As far as i understand, you have two interfaces in the same subnet. This is usually a bad idea. best regards Ulf Volmer
In article <003101d205da$b35b9a20$1a12ce60$@palmettoshopper.com>, TE Dukes <tdukes at palmettoshopper.com> wrote:> > Hello, > > > > I've been working on this for over a week. I don't think its working the > > way it should. > > > > Here's what I'm trying to do: > > > > I have a Windstream dsl router with wireless > 192.168.1.100 > > | > > | > > Centos 6.8 server eth0 > 192.168.1.110 > gateway 192.168.1.111 > > eth1 > 192.168.1.111 > gateway > > 192.168.1.100 > > | > > | > > Switch > other computers and devices > gateway 192.168.1.110 > > > > I want to send all internal traffic through 192.168.1.110, all external > > traffic through 192.168.1.111, then back through 192.168.1.110. > > > [Thomas E Dukes] > The above needs a little clarification: all external traffic through > 192.168.1.111 > 192.168.1.110> all other computers and devices.Assuming your subnet mask is 255.255.255.0, you have both interfaces on the same subnet, which won't work. You have two options: 1. Change the third number on the DSL router and on eth1, e.g. 192.168.2.100 and 192.168.2.111 2. Change the third number on eth0 and all the other computers and devices. Either of the above options will work. Choose whichever gives you least hassle. You need to make sure that all of the other devices have the address of your server's eth0 set as their default gateway. The server needs to have the address of the router as its default gateway. If the other devices want to get their addresses via DHCP (a good idea), you will need to run a DHCP server on your server machine, as they will be isolated from the router. You will also need to make sure IP forwarding is enabled on the server. Cheers Tony -- Tony Mountifield Work: tony at softins.co.uk - http://www.softins.co.uk Play: tony at mountifield.org - http://tony.mountifield.org