The answer to this question is probably well known but 
alas not to me.  PPP on 2.0.34 RedHat 5.1 has been working
very reliably for me. I recently upgraded a system and 
for reasons not related to ppp, I would like to run a 2.1.117
or 2.1.126 kernel.  PPP over 2.0.34 continues to work fine
on the new machine but I can't get it even to start on either
of the 2.1.x kernels. 

It gets a "network down" return code from the SIOCADDRT 
ioctl(). This looks to be out of the fib_semantics.c routine
which is part of the new routing table code (not present at
all in 2.0.34 kernels).  I have noticed some ad hoc fixes
in the sys-linux.c module of pppd for various lower levels
of 2.1.x kernels. 

Today I installed version 2.3.4 of ppp and built me a new
pppd but still no luck. 

Following is the log with debug enabled (and a few of my syslogs
added.)

Thanks for any insights,
Mike Westall
Profesor of Computer Science 
Clemson University
Clemson SC 29634  USA

 2757 Dec 23 18:52:17 jmw4 pppd[1065]: lcp_reqci: rcvd MAGICNUMBER
 2758 Dec 23 18:52:17 jmw4 pppd[1065]: (f0a1165e)
 2759 Dec 23 18:52:17 jmw4 pppd[1065]:  (ACK)
 2760 Dec 23 18:52:17 jmw4 pppd[1065]: lcp_reqci: rcvd PCOMPRESSION
 2761 Dec 23 18:52:17 jmw4 pppd[1065]:  (ACK)
 2762 Dec 23 18:52:17 jmw4 pppd[1065]: lcp_reqci: rcvd ACCOMPRESSION
 2763 Dec 23 18:52:17 jmw4 pppd[1065]:  (ACK)
 2764 Dec 23 18:52:17 jmw4 pppd[1065]: lcp_reqci: returning CONFACK.
 2765 Dec 23 18:52:17 jmw4 pppd[1065]: fsm_sdata(LCP): Sent code 2, id 1.
 2766 Dec 23 18:52:17 jmw4 pppd[1065]: fsm_rconfack(LCP): Rcvd id 1.
 2767 Dec 23 18:52:17 jmw4 pppd[1065]: fsm_sdata(IPCP): Sent code 1, id 1.
 2768 Dec 23 18:52:17 jmw4 pppd[1065]: IPCP: sending Configure-Request, id 1
 2769 Dec 23 18:52:19 jmw4 pppd[1065]: fsm_rconfreq(IPCP): Rcvd id 1.
 2770 Dec 23 18:52:19 jmw4 pppd[1065]: ipcp: received ADDR 
 2771 Dec 23 18:52:19 jmw4 pppd[1065]: (130.127.48.118)
 2772 Dec 23 18:52:19 jmw4 pppd[1065]:  (ACK) 
 2773 Dec 23 18:52:19 jmw4 pppd[1065]: ipcp: received COMPRESSTYPE 
 2774 Dec 23 18:52:19 jmw4 pppd[1065]: (45)
 2775 Dec 23 18:52:19 jmw4 pppd[1065]:  (ACK) 
 2776 Dec 23 18:52:19 jmw4 pppd[1065]: ipcp: returning Configure-ACK
 2777 Dec 23 18:52:19 jmw4 pppd[1065]: fsm_sdata(IPCP): Sent code 2, id 1.
 2778 Dec 23 18:52:19 jmw4 pppd[1065]: fsm_rconfack(IPCP): Rcvd id 1.
 2779 Dec 23 18:52:19 jmw4 pppd[1065]: ipcp: up
 2780 Dec 23 18:52:19 jmw4 pppd[1065]:  adding route  
 2781 Dec 23 18:52:19 jmw4 pppd[1065]: ioctl(SIOCADDRT) device route: Network is 
down(10
 2782 Dec 23 18:52:19 jmw4 pppd[1065]: sifaddr failed
 2783 Dec 23 18:52:19 jmw4 pppd[1065]: ipcp: down

.

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