Re: [mpls-linux-general] Problems with ethernet cards

[James R. L. <jl...@mi...>]

Hmmm.  Check your MAC addresses, check your IP addresses, then
make sure ARP is doing the right thing by running tcpdump.

Jim

On Wed, Mar 27, 2002 at 08:06:35PM +0100, Daniel Gregorio Catalan wrote:
> Hi!I'm making a network with some Pcs with MPLS-Linux installed over
> Red Hat 7.1.
> Now, I'm connecting the PCs directly with cross-connect cables and I
> have some problems.
> I am trying to connect 3 Pcs in this way 1--2--3, the first PC have a
> Realtek and
> a 3Com card but I use the Realtek to connect to the second PC, the second PC
> have
> two ethernet cards, one Realtek RTL 8139(A) and one 3Com 3c509 Tornado
> series, and the third PC have two 3Com cards and a Realtek one
> but I use one of the 3Com cards to connect to the second PC.
> 
> This is:
> 
> 1 (Realtek) <--> (Realtek) 2 (3Com) <--> (3Com) 3
> 
> Before I try to use mplsadm to configure the MPLS network, I am trying
> to test the connections making ping between them, but when I try it,
> it only work in one way, for example between 2 and 3 or between 1 and
> 2. And when I deactivate the card that seems that doesn't work in 2,
> and then when I reactivate it, it begins to work in the other way but it
> doesn't work in the first way that was working before.
> 
> It is:
> 
>    if the Realtek cards work in 2 <--> 1
>        I deactivate the Realtek (in 2) that works 2 <--> 1
>        I reactivate it
>        now, the 3Com works in 2 <--> 3
>        but the Realtek doesn't works in 2 <--> 1
> 
>    else
>         if the 3Com cards work in 2 <--> 3
>            I deactivate the 3Com (in 2) that works 2 <--> 3
>            I reactivate it
>            now, the Realtek works in 2 <--> 1
>            but the 3Com doesn't works in 2 <--> 3
> 
> (To activate and deactivate the cards I use the ifconfig command or
> the 'network configuration' utilitie that is in the 'System' menu on
> Gnome X-window system)
> (I am using IP addresses that belongs to the same network for all the
> cards, but I don't think this is a problem because I am doing a ping between
> two PCs that are directly connected.)
> 
> I don't know what it happens, if somebody have seen it before and
> know how to fix it, please help me!
> 
> And I don't know if it would make problems when I try to configure
> the MPLS network with mplsadm, I supose that if I can't ping in one
> way, MPLS wouldn't work in this way. Please, help me I don't know what to do
> so I
> would be very pleased if someone can help me.
> 
> Best regards.
> 
> Dani
> 
> 
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-- 
James R. Leu