Erwtimata sxetika me firewalls

[Athanasios Sidiropoylos]

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Kalh mera sas paidia.

Exw kana dyo erwtisoules pou 8a eimoun ypoxreos an mou ths apantousate.

Prin kana dyo hmeres prostesa sto firewall script mou (kala o 8eos na to
kanei alla leme twra) mia akoma entolh outososte na mplokarei
opoiadipote prospa8ia sindeshs sthn porta 135. Exw windows XP ston miso
disko tou foritou mou kai eipa mpas kai.... Oxi oti ta xrisimopoiw
kiolas alla. Ektote exei gemisei to log mou me prospa8ies sindeshs sthn
sigkekrimenh porta. H aporia mou se ayto to 8ema einai.... Oloi aftoi oi
ypologistes einai blasteroxtipimenoi ???????? Gia aplos ta XP twn
ypolipwn xristwn tou diadiktiou kanoun oti m....a tous katebei ?

Ena allo simantiko aythn thn fora 8ema exei na kanei me thn prosfata
apoxtisi8a DSL mou. Epidi to 8irio den exei (akoma) deyterh karta
diktiou ebala to DSL modem pano sto HUB opou ka8onte to 8irio kai o
foritos. To 8irio einai monimos sindemenos pleon sto Internet (peftei
ka8e 72 wres h sindesh). To forito prospa8ei na mpei meso to 8iriou. To
DSL modem den einai router alla to aplo modem Siemens Xpresslink. DHCP
DNS kai lipa trexoun sto 8irio.

To problima me aythn thn diatajh einai oti oute ta windows oute to Linux
mporoun na doune olo to Internet etsi opos exei apo to forito. Blepoun
ena meros mono. Yparxei lish gia ayto to problima gia prepei na kanw thn
sosth kinish kai na parw epitelous mia deyterh karta diktiou gia na
isixasw ? 8-) 8elw na palepsw Debian ston forito kai etsi opos exei h
katastash den mporw na kanw upgrade tiptis.

Epi tis eykerias. H sarge einai arketa kalh gia na balw ston forito ? H
sid ? 8elw na einai kai ligo mesa sta pragmata h dianomh pou 8a exw sto
forito.... Mhn einai aparxeomena ta programata ola opos sto woody. Den
me endiaferei oute kan h sta8erotita poly poly gia ton forito. Oxi bebea
na einai kai entelos ponokefalos... 8-)

Aaa nai kai ena telefteo. Shmera to proi ka8isa kai egrapsa ena mikro
perloscripto pou pernei san eisodo ta dedomena tou /var/log/messages kai
tiponei hmerominia ip hostname kai porta pou exei katagrafh oti ypirje
prospa8ia sindeshs.

To trexw me tail -f /var/log/messages |grep TTL | ./fire
O logos pou exw to grep einai oti den exw balei akoma kanena elenxo
esoterika tou programatos gia na filtrarei ta axrista dedomena. To
erwtima einai.... Giati ka8isterei xaraktiristika na tiposei ta dedomena
pou prepei na tiposei. Mazobonte kamia 5-10 grames kai tis tiponei
mazemenes sxedon. Yparxei periptosh na ka8isterei pano apo 15 lepta h
host (pou kalite gia na kanei resolve to hostname apo opou erxete h
prospa8ia sindeshs) na dosei apotelesma ??


Ayta ta liga.
Eyxaristw ek ton proterwn.

Sidhropoulos A8anasios
msx
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