Date: Sun, 30 Apr 95 17:12:05 -0400 From: crtb@helix.nih.gov (Chuck Bacon) To: bugs@FreeBSD.org Cc: crtb@helix.nih.gov Subject: pppd on FreeBSD2.0R Message-ID: <9504302112.AA11124@helix.nih.gov>
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I've run SLIP absolutely without trouble since installing 2.0R. Last
week I tried to replace SLIP with PPP. But I can't keep the connection
up. The symptom is consistent: The connection is established, and I
can do rlogin or rsh or telnet, with X up, but after about five
minutes, the system wedges. Once I got a good symptom:
-------------
Fatal Trap 12: page fault while in kernel mode
fault virtual address 0xf0550000
fault code: supervisor read, page not present
instruction pointer 0x8: 0xf0138d92 (<--not perfectly sure about 0x8)
process: pppd
Stopped at _pppfcs+0x16 xorb 0(%ebx),%dl
-------------
Here's pppfcs, in if_ppp.c:
-------------
/*
* Calculate a new FCS given the current FCS and the new data.
*/
static u_short
pppfcs(fcs, cp, len)
register u_short fcs;
register u_char *cp;
register int len;
{
while (len--)
fcs = PPP_FCS(fcs, *cp++);
return (fcs);
}
-------------
Plainly, the xorb appears in the PPP_FCS macro, defined in if_ppp.h:
-------------
#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
-------------
Here's the relevant
part of /etc/rc.local:
-------------
# Added 1/23/95, changed to pppgo 4/21/95 -- wouldn't it be neat if it works!
rm -f /var/spool/uucp/LCK..cua00
/usr/local/bin/pppgo &
-------------
And here's pppgo:
-------------
#!/bin/csh
# pppgo [ -d ]
# Usage as shown to get started
set LOCK = /var/spool/uucp/LCK..cua00
if ( -f $LOCK ) then
echo "cua00 is locked. Sorry"
exit 1
endif
set debug = ''
if ("x$1" == 'x-d') then;
set debug = echo
shift
endif
echo Debug is .$debug.
echo '$1' is $1
if (`whoami` != 'root') then
echo Sorry, you must be root
exit 1
endif
$debug stty -f /dev/cua00 crtscts hupcl 38400
$debug /usr/sbin/pppd modem crtscts defaultroute connect /usr/local/bin/chat83\
netmask 0xfffffe00 /dev/cua00 38400
$debug netstat -nr
## echo Remember to use pppstop when done.
------------
Finally, here's my config, DAISY (comments not entirely appropriate):
------------
#
# DAISY -- Generic machine with WD/AHx/NCR/BTx family disks
#
# DAISY,v 1.20 1994/11/18 19:10:25 jkh Exp
#
machine "i386"
cpu "I486_CPU"
ident DAISY
maxusers 10
options INET #InterNETworking
options FFS #Berkeley Fast Filesystem
options NFS #Network Filesystem
options MFS #Memory Filesystem
options MSDOSFS #MSDOS Filesystem
options "CD9660" #ISO 9660 Filesystem
options PROCFS #Process filesystem
options "COMPAT_43" #Compatible with BSD 4.3
options USER_LDT #Let users write descriptor tables
options SYSVSHM
options SYSVSEM
options SYSVMSG
options DODUMP
options DDB
options KTRACE
options "SYMTAB_SPACE=90000"
options UCONSOLE #X Console support
options "FAT_CURSOR" #block cursor in syscons or pccons
options "SCSI_DELAY=15" #Be pessimistic about Joe SCSI device
options "NCONS=8" #4 virtual consoles
config kernel root on wd0 swap on wd0 and wd1 dumps on wd0
controller isa0
controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 vector fdintr
disk fd0 at fdc0 drive 0
disk fd1 at fdc0 drive 1
controller wdc0 at isa? port "IO_WD1" bio irq 14 vector wdintr
disk wd0 at wdc0 drive 0
disk wd1 at wdc0 drive 1
controller aha0 at isa? port "IO_AHA0" bio irq ? drq 5 vector ahaintr
controller scbus0
device sd0
device sd1
device sd2
device sd3
device cd0 #Only need one of these, the code dynamically grows
device wt0 at isa? port 0x300 bio irq 5 drq 1 vector wtintr
device sc0 at isa? port "IO_KBD" tty irq 1 vector scintr
device npx0 at isa? port "IO_NPX" irq 13 vector npxintr
device sio0 at isa? port "IO_COM1" tty irq 4 vector siointr
device sio1 at isa? port "IO_COM2" tty irq 3 vector siointr
device lpt0 at isa? port? tty irq 7 vector lptintr
device pca0 at isa? tty
## device ed0 at isa? port 0x280 net irq 5 iomem 0xd8000 vector edintr
pseudo-device loop
pseudo-device ether
pseudo-device log
pseudo-device sl 2
pseudo-device ppp 2
pseudo-device pty 16
pseudo-device speaker
pseudo-device gzip # Exec gzipped a.out's
-------------
I don't know if the above is any use, but I'd be tickled if it sheds
some light.
Chuck Bacon - crtb@helix.nih.gov
ABHOR SECRECY - DEFEND PRIVACY
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