[lug] re:cisco 675/ppp question (Steven Deal)

Jopa jopa at beetfoundation.com
Wed Nov 15 13:28:17 MST 2000

I just went through this last week,
I never got wether you have more than 1 IP?
I am pretty sure they would have to give you at least two.
Anyway this is the issue that brought me to BLUG, and here is the article
that first got me going


since the above solution used as the address of eth0 to get out
I had to add an alias with one of my static ip's as eth0:0 to run httpd and

Who is your ISP? I am using uswest/qwest.net

Anyway if your not going to run a server this will be enough, I threw away
all of the docs
(that lead me to make eth0 and forged my own way with my IP's)

I have a 8 IP's of which some were reserved beyond my control
x.x.x.111 reserved broadcast
x.x.x.110 reserved gateway
x.x.x.104 reserved network
and I can use

so, here is how my 675 looks:

cbos#show int
           IP Address         Mask
eth0       x.x.x.110        #my ISP assigned default

vip0          N/A

vip1          N/A

vip2           N/A

wan0       Physical Port: Trained

           Dest IP Address    Mask
wan0-0    x.x.176.254     # My ISP assigns this, out of
my control

cbos#show nvram
[[ CBOS = Section Start ]]
NSOS Root Password = k/w0rcaf
NSOS Remote Restart = enabled
[[ PPP Device Driver = Section Start ]]
PPP Port Option = 00, IPCP,IP Address,3,Auto,Negotiation Not
PPP Port Option = 00, IPCP,Primary DNS Server,129,Auto,Negotiation Not
PPP Port Option = 00, IPCP,Secondary DNS Server,131,Auto,Negotiation Not
PPP Port User Name = 00, myISPusername
PPP Port User Password = 00, myISPpassword

This goes aginst what all the how to's I found said, but my connection
responds better than with the address on my machines eth0

My ifconfig is along the lines of:
eth0  inet addr:x.x.x.105 Bcast:x.x.x.111 mask:    #my ISP
said to use this mask?

lo  etc, etc.

Here is another opinion:

Once you get it to work, some good testing and tweaking tools at

Hope this helps,

> > The 675 gets the static IP on the wan0 end.  The other ends get the
> 10.0.0.x
> > addresses.  One thing you don't distinguish is whether it's
> using the dhcp
> > client or dhcp server.  If the client is being used, then
> it's on the wan0
> > end, and if it's the server, it's serving 10.0.0.x clients.
>  You don't
> need
> > the dhcp server really.  You can just assign to
> the eth0 port and
> > then 10.0.0.x to your machines.  This will make your life
> easier because
> you
> > don't have to worry about dhcp on the linux end which is
> kind of a pain.
> >
> > Your computers only deal with the cisco's eth0 end and only
> know enough to
> > send packets to it to get out to the rest of the world.  I
> believe that
> your
> > netmask for the computers is, despite the
> class A IP of
> > 10.0.0.x.  You can query this stuff by telnetting into the cisco.
> >
> > Chip
> There's a web interface to the 675 also, but you'll have to
> telnet into it
> to set it enabled.

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