# Vragen en antwoorden

&reporting.bugs;

## Vragen over telefoonnummer kiezen

Ik kan &kppp; niet laten werken. &kppp; vertelt me pppd werkt niet of dat er tijdslimiet is verstreken. Wat is er aan de hand?

Hebt u deze handleiding zorgvuldig gelezen? Hier zijn nog eens de meest algemene valkuilen:

- Click on the Details button. &kppp; will you give an excerpt from the PPP log messages (may not work on non-&Linux; systems, or even on some &Linux; distributions). The log will help you to track down the bug.

- Controleer dat pppd echt de binaire toepassing pppd is en geen script

- Controleer dat pppd is setuid `root`. U kunt deze modus instellen door het commando ``chmod` `u+s pppd`` als `root` uit te voeren.

- Controleer dat uw bestand `/etc/ppp/options` bestaat en dat het geen regels bevat die met elkaar in conflict zijn. Bij twijfel: laat dit bestand leeg.

- Make sure that you don't use the option `lock` as an argument for pppd (&kppp; is already taking care of device locking).

- Remove the `lock` option from both your `/etc/ppp/options` and `˜/.ppprc` files!

- Using the symbolic link `/dev/modem` may cause some conflicts. Eliminate this source of trouble by using the real device, &ie; `/dev/cuaX` or `/dev/ttySX`.

  COM1 is gelijk aan `ttyS0`, COM2 is `ttyS1` enzovoort.

- Make sure you set the right permission. In case of trouble you might want to run it as root first and then later, when everything is working fine give it less harmful permission if you can not afford to run &kppp; setuid `root`. The proper way to proceed would probably be creating a `modem` group.

- You might be launching pppd too early, &ie; before the remote server is ready to negotiate a PPP connection. If you are using a login script, you should use the built-in terminal to verify your login procedure. Some providers will require you to issue a simple `Send` or `Send ppp` to launch PPP. Some users even reported, that they had to append `Pause 1` or `Pause 2` to their script to solve timing conflicts.

Als niets helpt, dan kunt u enige debuginfotmatie krijgen uit uw systeemlogs met het commando:

    # tail /var/log/messages

pppd is dood - het systeem op afstand moet zichzelf authenticeren...

Typisch foutbericht in de systeemlog:

    pppd[699]: Het systeem op afstand moet zichzelf authenticeren
    pppd[699]: echter ik kon geen geschikt wachtwoord vinden om dat te doen.
    pppd[699]: (Geen van de beschikbare wachtwoorden liet toe een IP-adres te gebruiken.)

Voorzover ik kan nagaan zijn er twee oorzaken voor dit probleem:

- `/etc/ppp/options` bevat de `auth` option. Zet er eenvoudig een `#` voor om er commentaar van te maken en probeer het opnieuw.

- Your system already has a default route. Have you set up a local network? In this case recent versions of pppd will behave as if `auth` had been specified. To override this you may add `noauth` to the pppd arguments in kppp' setup dialog. Alternatively you could take down the local network prior to dialing in. I'd be thankful if someone could provide instructions on how to peacefully combine the two network connections.

pppd breekt in de 2.4.x Linux-kernel

Typische foutberichten in de systeemlog:

    pppd[1182]: pppd 2.3.11 started by user, uid 500
    pppd[1182]: ioctl(PPPIOCGFLAGS): Invalid argument
    pppd[1182]: tcsetattr: Invalid argument
    pppd[1182]: Exit.

Installeer pppd 2.4.0b1 of beter. Zie `Documentatie/wijzigingen` in de broncode van de kernel voor meer informatie.

Waarom vertelt &kppp; me Unable to open the modem?

This means that &kppp; doesn't have permissions to open the modem device or that you selected a modem device on the Modem Tab Dialog that is not valid. First make sure you selected the right modem device. Once you are sure you have selected the right modem device, you must give &kppp; the right permission to access the modem device and to be able to modify `/etc/resolv.conf` in case you want &kppp; to configure DNS correctly for you. If you can afford to run &kppp; setuid `root` this would solve all access problems for you, if not you will have to figure out what the right permissions are for your purposes. In order to give &kppp; setuid `root` permissions do the following:

    % su root
    # chown root:root $KDEDIR/bin/kppp
    # chmod +s $KDEDIR/bin/kppp
    # exit

Waarom vertelt &kppp; me dat het geen modem-lock-bestand kan aanmaken?

This in most instances means that you have installed &kppp; without setuid bit on while you, the person executing &kppp;, doesn't have write access to the lock file folder which by default is `/var/lock`. This for example is the case on &RedHat; systems. Check the modem dialog for the precise location you have chosen. The solution is easy -- either run &kppp; setuid if you can afford to, or give regular users write access to `/var/lock` or create a modem group that will have access to the `/var/lock` file.

Waarom is &kppp; geïnstalleerd met het setuid-bit aan?

There is no need for the setuid bit, if you know a bit of &UNIX; systems administration. Simply create a `modem` group, add all users that you want to give access to the modem to that group and make the modem device read/writable for that group. Also if you want DNS configuration to work with &kppp;, then `/etc/resolv.conf` must be read/writable by the members of that group. The same counts for `/etc/ppp/pap-secrets` and `/etc/ppp/chap-secrets` if you want to use the built-in PAP or CHAP support, respectively.

Het &kppp;-team heeft onlangs veel werk verzet om &kppp; setuid-safe te maken. Maar het is aan u om te bepalen om het te installeren en hoe.

You might also want to read the Security section.

What do I do when &kppp; just sits there and waits with the message: `Expecting OK`

Have you played with the CR/LF setting? Try CR, LF or CR/LF.

Alternatively, your modem might need some time to respond to its initialization. Open the Modem Commands dialog on the Modem tab and adjust the Pre-Init and Post-Init delays. See if you are successful when drastically increasing their values, and then do some fine-tuning later.

The connection works fine, but I can't start any applications!

You have probably selected the Auto Configure Host Name option, and the X Server has problems connecting to your newly named host. If you really need this option (and chances are you really don't), you are unfortunately on your own to set up the appropriate authorizations. Issuing ``xhost` `+`` before starting the connection would do the job, but be warned of the security risks involved, since this effectively gives everyone else access to your X Server.

&kppp; reports a successful connection, but &konqueror; just says Unknown host `hostname`, and &Netscape; reports The server does not have a DNS entry.

Try pinging another server by its IP number, ⪚ ``ping` `195.0.254.76``. If that works, you could try the following:

- Check if you have provided &kppp; with at least one DNS address.

- Check the contents of `/etc/host.conf`. There should be a line saying something similar to `order hosts, bind`. The `bind` keyword advises the resolver library to include a name server query when performing an address lookup. If such a line is not there, try adding it.

How do I make &kppp; send a \n or a \r

Just send an empty string such as in the following script:

    Send                            # send an empty string
    Expect           ID:
    Send             itsme
    Expect           word:
    Send             forgot
    Expect           granted
    Send             ppp

How can I stop &kppp; complaining: Can't create lock file?

This happens because you don't have permissions to create a lock file. If you chose to use a lock file, you must have write permission to the folder (typically `/var/lock`). This is of course no problem if you have given &kppp; setuid permissions. Please read the section on Lock files.

Why is my modem making so much noise when dialing?

Click on Setup, then Modem. You can control the modem volume here in three steps: Off, medium and high. For most modems, medium or high result in the same volume. If changing this setting doesn't work, make sure the correct settings for your modem are specified in Setup, Modem, Modem Commands.

I turned the modem volume to Off and verified the modem commands, but I still hear that awful noise during dialing. Why?

The volume initialization string can get lost if your modem can't cope with the speed it is receiving commands from &kppp;. Increase the value of Post-Init Delay in Setup, Modem, Modem Commands.

&kppp; keeps reporting unusual modem speeds like 115200 or 57600

Many modems only report the speed of the serial line and not the speed over the telephone line as default. You must configure these modems to report the true line speed by adding some commands to the modem init or dial strings. For many modems this command is `ATW2`. If you want to add it to the dial string (which normally starts with `ATD`), the new dial string would be `ATW2D`.

Why does &kppp; report Unknown speed

New modems often have very complex connection messages like `CONNECT LAP.M/V42.bis/115000:RX/31200:TX`, and &kppp; cannot parse this message correctly. Turn on Show Log and you'll see the connection speed.

I get a slow connection speed

If you are not satisfied with the modem speed, make sure you've set the connection speed (you can reach it by clicking on Setup, Device, Connection Speed) to 57600 or higher. Make sure your serial ports support higher speeds. Many older systems based on i486 do not work correctly if you set the speed to 115200. If you have an old 8250 UART chip, it won't work. If you have a 16550 or 16550A it should work flawlessly.

Additionally, you should consult your modem manual to look for init strings that enable a high speed mode.

I get a REALLY slow connection speed!

If data drips on at a rate of just a few bytes per second, you should check your hardware setup. If moving your mouse speeds up the transmission this is definitely a hardware issue!

You can obtain some information about your serial port with ``setserial` `-a `/dev/ttySx``` and check for interrupt conflicts with other components of your system.

My phone line needs pulse dialing instead of tone dialing (or vice-versa). How do I change that?

You must modify your modem dial string. Nearly all modems support the following AT commands:

`ATDT`

- Selects tone dialing

`ATDP`

- Selects pulse dialing

## Questions about Telephone Cost Rules

How do I write a telephones cost rules file?

Just follow the `TEMPLATE` rules file supplied with &kppp;. You should be able to find a copy in `$KDEDIR/doc/HTML/`yourlang`/kppp/`. Use the `-r` &kppp; command line option to check the syntax of your proposed rules file.

I have written a telephone cost rules for my region. Where can I submit it so that others can make use of it?

Can my phone cost rulefile contain fractional time units like "(0.17, 45.5)"?

Yes this is possible. But you shouldn't use unusually small time units below a tenth of a second, because this would result in higher CPU load, although you probably won't notice on a modern CPU.

My country observes other moving holidays than Easter.

In that case, you need to write new code that allows for the computation of that holiday. Please have a look at `ruleset.cpp` and emulate the easter example. Then send in the patches!.

## Questions about the System Logs

I see a message saying Serial line is looped back. What does this mean?

Short answer: You didn't start the PPP software on the peer system.

The logs show Signal 15

If you see the following lines, you've probably just received a timeout error from &kppp;. &kppp; has been waiting for the PPP interface to come up and gave up after the specified timeout. pppd was signalled to shut down, with signal number 15, &ie; SIGTERM.

    pppd[26921]: pppd 2.3.5 started by me, uid 500
    pppd[26921]: Using interface ppp0
    pppd[26921]: Connect: ppp0 <--> /dev/ttyS0
    pppd[26921]: Terminating on signal 15.
    pppd[26921]: Connection terminated.
    pppd[26921]: Exit.

What about Receive serial link is not 8-bit clean

The PPP daemon is alarmed by the fact that all the data it receives has bit 8 set to zero. In most cases this simply indicates that the remote PPP server isn't running yet. You might still be confronted by a login prompt that echoes back all the data sent by your pppd.

and can't locate module ppp-compress? What's this?

Do you see the following messages?

    modprobe: can't locate module ppp-compress-21
    modprobe: can't locate module ppp-compress-26
    modprobe: can't locate module ppp-compress-24

Just add the lines:

    alias ppp-compress-21 bsd_comp
    alias ppp-compress-24 ppp_deflate
    alias ppp-compress-26 ppp_deflate

to your `/etc/conf.modules` file.