autmaticky start pevne linky

[Miroslav Kes]

Jiri Hudak wrote:
> 
> Miroslav Kes wrote:
> 
> > Jiri Hudak wrote:
> > > muze mi nekdo poradit jak  osetrit automaticky start pevne linky ve
> > > freebsd. Ja jsem pouzil ttys ,ale zlobi nahazuje prakticky porad .
> > > Potrebuji aby, zjistil ,ze linka spadla a nahodil ji.

> > Mohl bys to nejak upresnit. Co vlastne pada?
> > Bud se rozpadne spojeni mezi modemy (ztrati nosnou apod.) nebo prestane
> > fungovat pppd. Pokud to druhe jake ppp pozivas? Kernel level nebo to
> > interaktivni (Toshiharu Ohno)?

>  Ahoj,
> o modemy se nejedna ty spoji samy, ale o pppd i kdyz zustane nahozeny
> nevytvori
> se ppp0 zarizeni. Pouzivam ppp0 v jadre ne tun0. Ted to resim pomoci
> cronu,
> ze co 5 min se pokousi nahodit pppd., ale lip by bylo kdyby to slo pomoci
> scriptu
> mam to vymyslene tak ze by se hlidal ve /var/run/ppp0.pid ,a pokud
> neexistuje
> tak by se spustil znovu pppd,ale scriptovaci jazyk moc neznam.

Na podobny problem jsem s pppd taky narazil a reseni, ktere pouzivam
vypada takto:

pppd je spousten ze scriptu a to vlastni volani je 
/usr/sbin/pppd file /etc/ppp/options

soubor /etc/ppp/options :

> more /etc/ppp/options
cuaa2
57600
crtscts
modem
lock
passive
domain MYDOMAIN
netmask MYNETMASK
LOCAL_IP_ADDRESS:

kde MYDOMAINMYDOMAINLOCAL_IP_ADDRESS jsou doplneny podle dane site.
Krome toho pouzivam take soubory ip-up a ip-down (viz man pppd), ktere
vypadaji takto:

> more /etc/ppp/ip-up
#!/bin/csh
 
if( $#argv < 5 ) then
        logger -i -s "ip-up: Issuficient number of parameters passed"
        exit 1
endif

if( $1 == "ppp0" ) then
        route -n add default REMOTE_IP_ADDRESS
        route -n add -host REMOTE_IP_ADDRESS LOCAL_IP_ADDRESS -interface
$4
endif


> more /etc/ppp/ip-down
#!/bin/csh
 
if( $#argv < 5 ) then
        logger -i -s "ip-down: Issuficient number of parameters passed"
        exit 1
endif

if( $1 == "ppp0" ) then
        route -n delete default
        route -n delete REMOTE_IP_ADDRESS
endif


Opet REMOTE_IP_ADDRESS a LOCAL_IP_ADDRESS jsou doplneny podle nasi site.
Ten script z ktery se o pppd stara je napsan takhle:

> more /usr/sbin/pppstart
#!/bin/csh

set conffile = "/etc/ppp/options"

if( $#argv > 0 ) goto usage

# leased line to the research center
if( ! -r $conffile ) then
        echo "pppstart: Configuration file $conffile missing!"
        echo "pppstart: Exiting!"
        exit 1
endif


# loop restarting pppd if it eventualy terminates 
while( 1 )
        set ppp_procs = `ps -ax | grep pppd | grep -v grep`
        if( $#ppp_procs == 0 ) then
                logger -i -s -t pppstart " Starting pppd using
$conffile"
                /usr/sbin/pppd file $conffile
                logger -i -s -t pppstart " pppd exited ! "
        else
                set def_route = `netstat -rn | grep default`
                if( $#def_route == 0 ) then
                        kill -9 $ppp_procs[1]
                endif
        endif
        sleep 30
end
exit 0

# ...and the usage stuff
usage:
echo "Usage: pppstart"
echo ""
echo "pppstart ifconfigs ppp interface and starts pppd for it"
echo "using configuration from $conffile"
echo "It restarts pppd if it eventually terminates."


Funguje to nasledovne:
pokud zadny pppd nebezi tak je spusten
pri ziskani IP konektivity nahodi ip-up (mimo jine) default route
pri jeji ztrate ip-down defaut route zrusi
po spusteni pppd se za 30 vterin zkontroluje jestli mame
IP konektivitu (default route existuje)  
pokud ne pppd se zastreli pocka se 30 vterin a vse se znovu opakuje.

Tak snad ti to pomuze prip.doda nejakou inspiraci.

Mira

-- 
-----------------------------------------------------------
|                     Miroslav Kes                        |
|---------------------------------------------------------| 
| Rockwell Automation Ltd.   | tel.:   (+420) 2 2425 6913 | 
| Research Center Prague     | fax:    (+420) 2 250467    |
| Americka 22                | e-mail: mira at rockwell.cz   |
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| Czech Republic             |                            |
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