[VLAN] vlan on eth0 works eth1-3 do not

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> > On Sun, Jul 16, 2006 at 05:16:32PM +0100, Linux wrote:
> > > Basically traffic coming in on eth3, needs to go out through a 
> > > default gateway of through eth0
> > >
> > > For traffic on eth3.40 I need this to route to via 
> > > eth0.40
> > >
> > > If that makes sense, both are wanting to go to the same IP 
> > > 135.166.X.Y.
> > >
> > > To make things more complex the route\40.1 
> is running 
> > > the DHCP server which I need to continue to use.
> > >
> > > I need to control traffic so that they can only access 
> certain ports 
> > > ranges and IPs
> > >
> > > If anyone has any suggestions on how this would be 
> possible, I would 
> > > be grateful.
> > 
> > Now we're getting somewhere. But still missing some details.
> > 
> > eth0:
> > eth0.40:
> > 
> > eth3: what IP net?
> > eth3.40: what IP net?
> >
> At the moment they are the same as eth0 as they are bridged.
> > 
> > If you want to use the same IP net on more than one 
> interface you have 
> > to make a bridge.
> > 
> > If you want to control bridged traffic you can use either 
> ebtables or 
> > iptables. Bridged traffic passes through the iptables FORWARD chain 
> > with input-interface and output-interface both set to the bridge.
> I do see the outward going packets in iptables the reason I 
> don't see the
> return I think is due to it been the return of a packet that 
> has already
> been allowed through.
> I am going to try doing some filtering on what is and is not allowed
> tomorrow morning to see what happens.
> > If you want to make traffic that comes in on a bridge not 
> be bridged 
> > by Linux but instead be routed by Linux you have to use at 
> least one 
> > ebtables rule to DROP that traffic in the BROUTE ebtable as said 
> > earlier. I can't say yet if you need this.
> > 
> At the moment I require one DROP rule to make packets go 
> through the VLAN
> bridge.
> If traffic goes from the switch to the bridge then to the 
> router it works
> fine, if traffic goes from the router to the bridge then to 
> the switch I
> need the DROP rule, I do not know if this is due to a setting 
> in the switch
> or the router which I why I only need a rule one way.
> > 
> > Both and are routers of some 
> sort. Will both 
> > work as default gateway and you just want to decide between 
> them only 
> > based on incoming source interface, or is the routing more complex?
> They are both the same router just in different VLANS, in the 
> current set-up
> the DHCP server hands them out as the default gateway due to 
> the bridge
> configuration.
> The routing is not that complex, everything from the 
> 192.168.40.x range
> should go to the 40.1 gateway and 182.168.20.x should go to the 20.1
> gateway.
> It does get a bit more complex in that there will also be 
> eth2 and eth2:40
> which need to route the traffic as well just be isolated from eth3 and
> eth3:40.
> I am not thinking if I can control the traffic using iptables for the
> bridges, is what 2, three way bridges linking the three NICs 
> eth0, eth2 and
> eth3, then use iptables to control what can access what.
> I then need to tell the bridge that any traffic for the 
> 172.22/
> range not to be bridged but to go to the routing table, so it 
> flows out of
> eth1, with iptables again controlling the traffic, I think I 
> can do this
> with correctly placed ebtables rules.

I have managed to get everything working except for get the 172.22 
address to escape from the bridge and hit the routing table to be routed 
over the general network, eth1

I think this rule should do it, but the packets seem to disappear into no

ebtables -t broute -A BROUTING -p IPv4 --ip-destination -i
eth3 -j DROP

Does anyone have nay suggestions?


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