[mpls-linux-general] "RTNETLINK answers" problems running iproute2 to setup lsp RH8

[Murthy S. A. <msa...@cs...>]

My kernel is 2.4.18-14. (Redhat 8). I have downloaded mpls-linux, and 
compiled it following the instructions in the various files that came with 
it. I have also followed instructions to configure the kernel for MPLS and
compiled it. and, also downloaded and compiled iproute2 
(iproute2-current...).

I am trying to work through the instructions to manually setup an lsp
between 2 machines, given in mpls-linux-1.1/utils/README.

I am successful at the first two steps, i.e.

 mplsadm -A -O 0
(Key : 0x00000002)
 mplsadm -O 0x00000002 -o push:gen:16:set:eth1:ipv4:IPADDRESS_OF_DEST

but the next step - 

ip route add IPADDRESS_OF_DEST/25 lsp 0x00000002 

has been failing with 

RTNETLINK answers : Invalid argument

I have looked it up on the net and changed whatever config parameters I 
could think of in the kernel. also changed the Qos paramters to build
statically in the kernel instead of as modules. Nothing works.

I have traced the problem to as far as the recvmsg() call in 
iproute2/lib/libnetlink.c: rtnl_talk(). Do not know if the root of the 
problem is actually at some stage prior to this call, when we initialize 
the data structures.

Any ideas ? This problem seems to have been reported a lot. and there 
seems to be no indication of the solution other than to say 'some' 
kernel config issues. one parameter that is mention is the 
CONFIG_RTNETLINK, which does not seem to be available in RH8.

Any help is greatly appreciated. 

Thanks a lot in advance
Murthy ANdukuri