2. Syxna problhmata

1. Question

   Pairnw to mhnyma

   ioctl(SIOCGIFBR) failed: Package not installed
           
   

   Ti shmainei;

   Answer

   Den exete bridging dynatothtes ston pyrhna. Parte pyrhna 2.0 h megalutero, kai anametaglwttiste to me thn epilogh BRIDGING energopoihmenh.

2. Question

   Mhxanhmata sth mia pleyra de mporoun na kanoyn ping sthn allh!

   Answer

   • Energopoihsate to bridging me ``brcfg -ena''; (to brcfg 8a prepei na leei ``bridging is ENABLED'')
   • Balate tis kartes se promiscuous mode? (gracte ``ifconfig''. To ``PROMISC'' prepei na emfanistei kai stis duo pleyres.)
   • An xrhsimopoieite kartes diasundeshs pollaplwn meswn sigoyreyteite oti to swsto exei energopoih8ei. Isws xreiastei na xrhsimopoihsete to programma ry8misewn poy phrate me thn karta.

3. Question

   De mporw na kanw telnet/ftp apo th gefyra! Giati;

   Answer

   Ayto de ginetai efoson den yparxei IP dieu8ynsh sth gefyra. H gefyra prepei na einai ena diafano meros toy diktuoy.

4. Question

   Ti prepei na kanw gia na ry8misw th dromologhsh;

   Answer

   Tipota! H dromologhsh elegxetai apo ton kwdika toy pyrhna. Gia na deite tis ethernet diey8unseis opws ma8ainontai apo th gefyra xrhsimopoihste to brcfg se debug mode:

   brcfg -deb
           
   

5. Question

   H gefyra fainetai na doyleuei, alla to ``traceroute'' de deixnei th gefyra ws meros ths diadromhs.

   Answer

   Logw ths fushs ths gefyras, to ``traceroute'' DEN prepei na deijei th gefyra. H gefyra einai diafanhs sto diktyo.

6. Question

   Einai aparaithto na metaglwttisw ton pyrhna me IP_FORWARD;

   Answer

   Oxi. O kwdikas gia to bridging ston pyrhna frontizei gia th metafora. To IP_FORWARD einai gia pulh poy exei IP dieu8ynsh.

7. Question

   Giati oi diey8unseis gia th 8ura 1 kai 8ura 2 einai idies sumfwna me to ``brcfg''; De 8a eprepe na einai diaforetikes;

   Answer

   Oxi. Ka8e 8ura sth gefyra exei epithdes thn idia dieu8ynsh, opws dinetai apo ton kwdika toy bridging.

8. Question

   To bridging den emfanizetai ws epilogh otan kanw make config gia ton pyrhna. Pws to energopoiw;

   Answer

   Kata thn parametropoihsh, apanthste 'Y' sthn erwthsh: ``Prompt for development and/or incomplete code/drivers (CONFIG_EXPERIMENTAL) [Y/n/?]''.

9. Question

   Polloi komboi (hubs, 4 h parapanw) syndemena se seira prokaloun problhmata sygxronismou se ethernet. Ti epiptwseis exei ayto se ena ypodiktyo poy einai sthmeno me hubs;

   Answer

   H gefyra anaorizei ton kanona twn 3/4/5 kombwn. H gefyra den xeirizetai ta paketa dedomenwn opws ena hub, opote den dhmioyrgei problhmata sygxronismou sto diktyo.

10. Question

    Mporei mia gefyra na syndesei duo tmhmata me 10Mb kai 100Mb; Tetoia diamorfwsh 8a ephreasei thn taxuthta sthn grhgora pleyra;

    Answer

    Nai, h gefyra mporei na syndesei ena tmhma 10Mb me ena tmhma 100Mb. Efoson h karta diktuoy sto grhgoro diktyo ftanei ta 100Mb, to TCP frontizei gia ta ypoloipa. Fysika, ta dedomena apo to grhgoro pros to argo tmhma 8a metaferontai me 10Mb/s, alla h ypoloiph kinhsh sto grhgoro diktyo den epibradunetai.