LARTC - Jul 2004 - FW: Static ip addresses/aliases previously (my mistake) htb: class 10007 isn''t work conserving ?!

>> No I am using the EN5861, just that we have two ADSL lines and only 
>> one
>> EN5861 and rather than buying another I''d like to use linux to
do the
>> same job as the en5861, if you know what I mean.
>
>You can, but since you have two ADSL lines, you''ll need two ADSL
devices of
some kind, whether it''s a pair of 5861s, or a 5861 and an ADSL port
adapter
(external modem, PCI card, whatever) that Linux
supports.
>
>The simplest solution will be to have the same setup for both lines.
Either use two 5861s, or get two ADSL adapters that Linux >can talk
to.
>
>> So far I''ve set up ppp0:0 which I''ve assigned one of
the static ip
>> addresses supplied to us by our ISP but when I try and route through 
>> it i.e. ip route add default dev ppp0:0 table T1 then it returns the 
>> error no such device, which it''s quite right there
isn''t.  If I route
>> through it using the ip address of ppp0:0 i.e ip route add default via 
>> x.x.x.193 table T1 then it does work but anything that goes through it 
>> ends up using the IP address of ppp0.
>
>So both lines were supplied by the same ISP?
They sure are.  Due to our location we can''t have an ADSL line faster
than
512kbs so we''ve got two and I''m trying to load balance them..
But that''s
another story.
>
>> So how can I set up the linux box to use these static IP addresses in 
>> the same way I can with the EN5861?
>
>If you want to remove the 5861 from the picture entirely, you''ll
need to
replace it with some sort of ADSL adapter.  You can''t just plug a DSL
line
into an ethernet card.
>> I hope I''d made myself clear, it''s hard trying to
explain something
>> when your not to sure exactly what your talking about.  Anyway any 
>> help with be gladly received.
>
>It would help if you could draw a diagram of your network so we could get a
better idea of what yo''re trying to do.

Ok I''m not the best at ASCII diagrams but here goes anyway... (well
I''ll
modify the one in the advanced routing howto)

                                          +------------+        /
                          +---------------|            |       |     IP
ADDRESSES
                          |    +----------+ EN5861     +-------      EN5861
- 217.x.196.222
        __                |    |          |            |     /       eth0 -
10.0.0.152
    ___/  \_         +------+-------+     +------------+    |        eth1 -
217.x.196.217
  _/        \__      |   eth2 eth1  |                      /         eth2 -
217.x.196.218
 /             \eth0 |              |                      |         ppp0 -
217.x.230.198
| Local network -----+ Linux router |                      |         ppp0:0
- 217.x.230.193
 \_           __/    |              |                      |     Internet
   \__     __/       |     ppp0     |                      \
      \___/          +------+-------+     +------------+    |
                            |             |            |     \
                            +-------------+ USB        +-------
                                          | Speedtouch |       |
                                          +------------+ 


As you can see the linux router has 3 network adapters, eth0 being the local
lan and eth1 & eth2 are both connected to the EN5861 router.  I''ve
done that
because I couldn''t work out any other way to use the static IP address
that
out ISP have given us.  For each connection we''ve got 5 IP addresses
plus
one for for the router.  Eth1 & eth2 work fine ie both have the correct
static IP address given to us by our ISP but it seems impraticle putting in
another 3 cards to make use of the other IP addresses we have, there must be
another way.

Cheers for the replies, I hope this makes things a bit easier to understand.
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>eth1 & eth2 are both connected to the EN5861 router.  I''ve done
that
>because I couldn''t work out any other way to use the static IP
address that
>out ISP have given us.  
>
Aha, this is a config question.  You can just add as many ip addresses 
to each physical card as you like.  I forget the exact syntax, but check 
man pages for "ifconfig" and look for "aliases".

Chances are your distro already has support for this.  For example in 
gentoo you edit /etc/conf.d/net and edit the aliases line.  Different 
configs for all "normal" distros, but same idea
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[Sorry if this is received twice. Sent it with the wrong address once, not
 sure if the moderator will approve it.]

On Tue, Jul 06, 2004 at 08:22:42AM +0100, Chris Bolton
wrote:
> Ok I''m not the best at ASCII diagrams but here goes anyway...
(well I''ll
> modify the one in the advanced routing howto)
Does this look right?  Forget eth0 on Linux for a moment.

----------                                            ----------
|        | eth1 217.x.196.217/29 --- 217.x.196.222/29 | EN5861 | ___ DSL ___
|        | eth2 217.x.196.218/29 --------------- eth0 | router |      #1
| Linux  |                                            ----------
| router |                                        --------------
|        | ppp0 217.x.230.198/29 ---------------- | Speedtouch | ___ DSL ___
|        | ppp0:0 217.x.230.193/29 -----''         | DSL bridge |     
#2
----------                                        --------------
> As you can see the linux router has 3 network adapters, eth0 being the
local
> lan and eth1 & eth2 are both connected to the EN5861 router. 
I''ve done that
> because I couldn''t work out any other way to use the static IP
address that
> out ISP have given us.  For each connection we''ve got 5 IP
addresses plus
> one for for the router.  Eth1 & eth2 work fine ie both have the correct
> static IP address given to us by our ISP but it seems impraticle putting in
> another 3 cards to make use of the other IP addresses we have, there must
be
> another way.
Ok, so the Speedtouch is some sort of DSL bridge, right?  Meaning when you
establish PPP (PPPoE?) to your ISP, you really have another ethernet card
(eth3?) connected to the Speedtouch?

First, as someone else pointed out, the eth1/eth2 connections to the EN5861
are redundant.  You can set up interface aliases on eth1 so it has both IP
addresses.

  % ip addr add 217.x.196.217/29 brd 217.x.196.223 dev eth1
  % ip addr add 217.x.196.218/29 brd 217.x.196.223 dev eth1 label eth1:0

PPP is set up similarly.  (PPPoE might configure ppp0 for you.)

  % ip addr add 217.x.230.198/29 brd 217.x.230.199 dev ppp0
  % ip addr add 217.x.230.193/29 brd 217.x.230.199 dev ppp0 label ppp0:0

You can continue to add as many aliases to either interface as you like.

Your problem then becomes load-balancing outbound traffic, because you have
two potential default routes.  One is the PPPoE connection via the
Speedtouch (the remote IP is probably the DSL concentrator at your ISP).
The other is the EN5861 on 217.x.196.222/29 (which in turn is probably
talking to the same DSL concentrator as the Speedtouch).

The simplest approach (aside from defaulting everything out one interface,
which you probably don''t want) is to policy route based on source IP. 
If
the source IP of a packet as it leaves the Linux router is 217.x.196.x/29,
the packet should get routed via eth1 to the EN5861.  If the source is
217.x.230.x/29, it should be routed via ppp0 to the Speedpath.  There are
examples of this in the LARTC HOWTO.  How you want to set up your NAT for
eth0 to take advantage of one connection or the other is up to you.

-James

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