Parakalw bohqeiste me! Problhma me to Internet!

[Dimitrios P. Bouras]

Peter Avgeris wrote:
> 
> Etsi allaja ta IP addresses sto men Pentium apo 195.195.195.1 se 192.168.1.1
> kai ston 486 apo 195.195.195.2 se 192.168.1.2, dhladh se 'epitreptes'
> dieyqynseis.

  Poly wraia :)

> Etsi, otan didw 'route' ston 486 pairnw:
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> 192.168.1.0     *               255.255.255.0   U     0      0        3 eth0
> 127.0.0.0       *               255.0.0.0       U     0      0        3 lo
> default         pa1.pavgeris.gr 0.0.0.0         UG    0      0        0 eth0

  Epishs ola wraia kai edw :)
 
> Antistoixa, ston Pentium didontas route pairnw:
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> 192.168.1.0     *               255.255.255.0   U     0      0        8 eth0
> 127.0.0.0       *               255.0.0.0       U     0      0       16 lo
[snip]
> DE MOY BGAZEI KAQOLOY
> COMMAND PROMPT. Osa 'Return' kai na patw den ginetai tipote, apla grafei kenes
> grammes apo katw, xwris command prompt. Den mporw na katalabw ti ginetai...

  Edw ginetai to e3hs: o resolver prospa0ei na "rwthsei" kapoion apo
 tous DNS server pou exeis balei sto /etc/resolv.conf gia kati pou
 0elei. Ti na 0elei anarwtiesai; Mporeis na tre3eis "netstat -nr"
 anti "netstat -r" gia na mhn prospa0hsei na kanei name resolution,
 gia na deis to routing table. Gia to parapanw, ka0'oti den yparxei
 syndesh me to diktyo, h "erwthsh" peftei "sto keno", dhladh ean
 perimeneis arketa na kanoun timeout ola ta queries stous 3 DNS
 servers pou exeis balei sto /etc/resolv.conf, 0a pareis kai prompt
 (kapoia stigmh :))

> Mesa sto /etc/resolv.conf exw balei oloys toys Domain Name Servers poy
> xrhsimopoiw.

  Ka0ws exeis balei DNS servers pou einai "kapou" sto diktyo,
 otan, xwris na eisai syndedemenos, gia kapoio logo o resolver
 prospa0hsei na brei kati non-local (kyta gia th seira tou pws
 psaxnei o resolver sto /etc/host.conf h to /etc/nsswitch -- h
 opws alliws legetai se glibc-2 based systhmata opws to RedHat-5.x)
 tote to process pou zhthse to name-resolution, 0a kollhsei
 megaloprepestata :)

  Akribws gia na antimetwpistei to parapanw problhma, ta ip-up
 kai ip-down pou synodeyoun to xisp, einai ftiagmena na pros0etoun
 (ip-up) tous dyo DNS servers pou orizeis sth forma "TCP/IP Options"
 sto /etc/hosts.conf afou synde0eis sto diktyo, kai na ta afairoun
 (ip-down) otan aposyndeesai.

  Prin synnexisw, dwse ena "netstat -nr" prin kai afou synde0eis,
 kai steile ta routing tables gia na doume ti psaxnei na kanei
 resolve to netstat.

  Dhmhtrhs
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