PPP and virtual lo: routing problem

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I'm setting up a PPP link between two Linuxes.  Let them be called as
server (who receives a call) and client (who calls out).  After the
connection has been established, the machines have got the following
interfaces:

Server (2.4.22):
        lo      127.0.0.1       /8
        eth0    192.168.1.1     /24
        ppp1    192.168.1.253   /32

Client (2.4.20):
        lo      127.0.0.1       /8
        lo:1    192.168.1.4     /24
        ppp0    192.168.1.254   /32

And in this configuration no one ping from the server has a reply.  As
well as any other kind of connection from the server waits forever for
the reply.  (There are no firewall at the any side.)

And the problem seems to be with lo:1.  If I remove it, or if I change
its address to 192.168.2.x, all becomes ok.

So, what does it mean?  Is it just my mistake or something like a
kernel (?) bug?

Thanks in advance.
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