mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 03:40:53 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
225 lines
7.9 KiB
Plaintext
225 lines
7.9 KiB
Plaintext
simple isdn4linux PPP FAQ .. to be continued .. not 'debugged'
|
|
-------------------------------------------------------------------
|
|
|
|
Q01: what's pppd, ipppd, syncPPP, asyncPPP ??
|
|
Q02: error message "this system lacks PPP support"
|
|
Q03: strange information using 'ifconfig'
|
|
Q04: MPPP?? What's that and how can I use it ...
|
|
Q05: I tried MPPP but it doesn't work
|
|
Q06: can I use asynchronous PPP encapsulation with network devices
|
|
Q07: A SunISDN machine can't connect to my i4l system
|
|
Q08: I wanna talk to several machines, which need different configs
|
|
Q09: Starting the ipppd, I get only error messages from i4l
|
|
Q10: I wanna use dynamic IP address assignment
|
|
Q11: I can't connect. How can I check where the problem is.
|
|
Q12: How can I reduce login delay?
|
|
|
|
-------------------------------------------------------------------
|
|
|
|
Q01: pppd, ipppd, syncPPP, asyncPPP .. what is that ?
|
|
what should I use?
|
|
A: The pppd is for asynchronous PPP .. asynchronous means
|
|
here, the framing is character based. (e.g when
|
|
using ttyI* or tty* devices)
|
|
|
|
The ipppd handles PPP packets coming in HDLC
|
|
frames (bit based protocol) ... The PPP driver
|
|
in isdn4linux pushes all IP packets direct
|
|
to the network layer and all PPP protocol
|
|
frames to the /dev/ippp* device.
|
|
So, the ipppd is a simple external network
|
|
protocol handler.
|
|
|
|
If you login into a remote machine using the
|
|
/dev/ttyI* devices and then enable PPP on the
|
|
remote terminal server -> use the 'old' pppd
|
|
|
|
If your remote side immediately starts to send
|
|
frames ... you probably connect to a
|
|
syncPPP machine .. use the network device part
|
|
of isdn4linux with the 'syncppp' encapsulation
|
|
and make sure, that the ipppd is running and
|
|
connected to at least one /dev/ippp*. Check the
|
|
isdn4linux manual on how to configure a network device.
|
|
|
|
--
|
|
|
|
Q02: when I start the ipppd .. I only get the
|
|
error message "this system lacks PPP support"
|
|
A: check that at least the device 'ippp0' exists.
|
|
(you can check this e.g with the program 'ifconfig')
|
|
The ipppd NEEDS this device under THIS name ..
|
|
If this device doesn't exists, use:
|
|
isdnctrl addif ippp0
|
|
isdnctrl encap ippp0 syncppp
|
|
... (see isdn4linux doc for more) ...
|
|
A: Maybe you have compiled the ipppd with another
|
|
kernel source tree than the kernel you currently
|
|
run ...
|
|
|
|
--
|
|
|
|
Q03: when I list the netdevices with ifconfig I see, that
|
|
my ISDN interface has a HWaddr and IRQ=0 and Base
|
|
address = 0
|
|
A: The device is a fake ethernet device .. ignore IRQ and baseaddr
|
|
You need the HWaddr only for ethernet encapsulation.
|
|
|
|
--
|
|
|
|
Q04: MPPP?? What's that and how can I use it ...
|
|
|
|
A: MPPP or MP or MPP (Warning: MP is also an
|
|
acronym for 'Multi Processor') stands for
|
|
Multi Point to Point and means bundling
|
|
of several channels to one logical stream.
|
|
To enable MPPP negotiation you must call the
|
|
ipppd with the '+mp' option.
|
|
You must also configure a slave device for
|
|
every additional channel. (see the i4l manual
|
|
for more)
|
|
To use channel bundling you must first activate
|
|
the 'master' or initial call. Now you can add
|
|
the slave channels with the command:
|
|
isdnctrl addlink <device>
|
|
e.g:
|
|
isdnctrl addlink ippp0
|
|
This is different from other encapsulations of
|
|
isdn4linux! With syncPPP, there is no automatic
|
|
activation of slave devices.
|
|
|
|
--
|
|
|
|
Q05: I tried MPPP but it doesn't work .. the ipppd
|
|
writes in the debug log something like:
|
|
.. rcvd [0][proto=0x3d] c0 00 00 00 80 fd 01 01 00 0a ...
|
|
.. sent [0][LCP ProtRej id=0x2 00 3d c0 00 00 00 80 fd 01 ...
|
|
|
|
A: you forgot to compile MPPP/RFC1717 support into the
|
|
ISDN Subsystem. Recompile with this option enabled.
|
|
|
|
--
|
|
|
|
Q06: can I use asynchronous PPP encapsulation
|
|
over the network interface of isdn4linux ..
|
|
|
|
A: No .. that's not possible .. Use the standard
|
|
PPP package over the /dev/ttyI* devices. You
|
|
must not use the ipppd for this.
|
|
|
|
--
|
|
|
|
Q07: A SunISDN machine tries to connect my i4l system,
|
|
which doesn't work.
|
|
Checking the debug log I just saw garbage like:
|
|
!![ ... fill in the line ... ]!!
|
|
|
|
A: The Sun tries to talk asynchronous PPP ... i4l
|
|
can't understand this ... try to use the ttyI*
|
|
devices with the standard PPP/pppd package
|
|
|
|
A: (from Alexanter Strauss: )
|
|
!![ ... fill in mail ]!!
|
|
|
|
--
|
|
|
|
Q08: I wanna talk to remote machines, which need
|
|
a different configuration. The only way
|
|
I found to do this is to kill the ipppd and
|
|
start a new one with another config to connect
|
|
to the second machine.
|
|
|
|
A: you must bind a network interface explicitly to
|
|
an ippp device, where you can connect a (for this
|
|
interface) individually configured ipppd.
|
|
|
|
--
|
|
|
|
Q09: When I start the ipppd I only get error messages
|
|
from the i4l driver ..
|
|
|
|
A: When starting, the ipppd calls functions which may
|
|
trigger a network packet. (e.g gethostbyname()).
|
|
Without the ipppd (at this moment, it is not
|
|
fully started) we can't handle this network request.
|
|
Try to configure hostnames necessary for the ipppd
|
|
in your local /etc/hosts file or in a way, that
|
|
your system can resolve it without using an
|
|
isdn/ippp network-interface.
|
|
|
|
--
|
|
|
|
Q10: I wanna use dynamic IP address assignment ... How
|
|
must I configure the network device.
|
|
|
|
A: At least you must have a route which forwards
|
|
a packet to the ippp network-interface to trigger
|
|
the dial-on-demand.
|
|
A default route to the ippp-interface will work.
|
|
Now you must choose a dummy IP address for your
|
|
interface.
|
|
If for some reason you can't set the default
|
|
route to the ippp interface, you may take any
|
|
address of the subnet from which you expect your
|
|
dynamic IP number and set a 'network route' for
|
|
this subnet to the ippp interface.
|
|
To allow overriding of the dummy address you
|
|
must call the ipppd with the 'ipcp-accept-local' option.
|
|
|
|
A: You must know, how the ipppd gets the addresses it wanna
|
|
configure. If you don't give any option, the ipppd
|
|
tries to negotiate the local host address!
|
|
With the option 'noipdefault' it requests an address
|
|
from the remote machine. With 'useifip' it gets the
|
|
addresses from the net interface. Or you set the address
|
|
on the option line with the <a.b.c.d:e.f.g.h> option.
|
|
Note: the IP address of the remote machine must be configured
|
|
locally or the remote machine must send it in an IPCP request.
|
|
If your side doesn't know the IP address after negotiation, it
|
|
closes the connection!
|
|
You must allow overriding of address with the 'ipcp-accept-*'
|
|
options, if you have set your own or the remote address
|
|
explicitly.
|
|
|
|
A: Maybe you try these options .. e.g:
|
|
|
|
/sbin/ipppd :$REMOTE noipdefault /dev/ippp0
|
|
|
|
where REMOTE must be the address of the remote machine (the
|
|
machine, which gives you your address)
|
|
|
|
--
|
|
|
|
Q11: I can't connect. How can I check where the problem is.
|
|
|
|
A: A good help log is the debug output from the ipppd...
|
|
Check whether you can find there:
|
|
- only a few LCP-conf-req SENT messages (less then 10)
|
|
and then a Term-REQ:
|
|
-> check whether your ISDN card is well configured
|
|
it seems, that your machine doesn't dial
|
|
(IRQ,IO,Proto, etc problems)
|
|
Configure your ISDN card to print debug messages and
|
|
check the /dev/isdnctrl output next time. There
|
|
you can see, whether there is activity on the card/line.
|
|
- there are at least a few RECV messages in the log:
|
|
-> fine: your card is dialing and your remote machine
|
|
tries to talk with you. Maybe only a missing
|
|
authentication. Check your ipppd configuration again.
|
|
- the ipppd exits for some reason:
|
|
-> not good ... check /var/adm/syslog and /var/adm/daemon.
|
|
Could be a bug in the ipppd.
|
|
|
|
--
|
|
|
|
Q12: How can I reduce login delay?
|
|
|
|
A: Log a login session ('debug' log) and check which options
|
|
your remote side rejects. Next time configure your ipppd
|
|
to not negotiate these options. Another 'side effect' is, that
|
|
this increases redundancy. (e.g your remote side is buggy and
|
|
rejects options in a wrong way).
|
|
|
|
|
|
|