[linux] rozsah IP adries a subnet

Matus "fantomas" Uhlar uhlar na fantomas.sk
Pátek Květen 9 18:24:13 CEST 2003


-> ************
-> L1)
-> ked pingujem (z 10.0.0.6) broadcast napr. 10.0.0.255, tak pinguje
-> localhost_sietovku, alebo niekt. zo strojov
-> 64 bytes from 10.0.0.6: icmp_seq=11 ttl=255 time=0.1 ms
-> 64 bytes from 10.0.0.7: icmp_seq=11 ttl=255 time=0.7 ms (DUP!)
-> 64 bytes from 10.0.0.1: icmp_seq=11 ttl=255 time=1.6 ms (DUP!)
-> zaujimave je vsak, ze su tam DUPlikovane pakety (vzdy na cudzi_pc, na seba
-> nema DUP)
-> ze pinguje iba linux stroje (v binde nie su w2k stroje, avsak to by nemalo
-> byt podstatne; bezia 2-3w2k a 4-5*linux)

no yo, ked posles do siete request, tvoja vlastna ethernet karta/masina ti na to
odpovedat nezvykne, to robia len ostatne masiny...
no a toto je broadcast preto odpoveda kazda masina ktora nema zakazane
odpovedat na broadcast.

-> W1)
-> 
-> ping -t 10.0.0.255 z wxp
-> E:\Documents and Settings\>ping -t 10.0.0.255
-> 
-> Pinging 10.0.0.255 with 32 bytes of data:
-> 
-> Reply from 10.0.0.6: bytes=32 time<1ms TTL=255
-> Reply from 10.0.0.6: bytes=32 time<1ms TTL=255
-> Reply from 10.0.0.6: bytes=32 time<1ms TTL=255

-> 1. preco nevypisuje DUP packety (mozno nevypisuje, ale su)

asi neschopny ping, sak windowsy nevies? :)

-> 2. preco pinguje iba 10.0.0.7 (75%) a 10.0.0.6 (zvysok) ^ nepinguje seba ^

zrejme pinguje broadcast, a tato IP asi odpoveda najrychlejsie

-> nepinguje 10.0.0.1 (na 6 a 7 nebezia ziadne sluzby zaujimave pre w2k) na
-> 0.1 bezi bind a je to GW aj DNS pre w2k ^ wxp

to s tym nema nic spolocne

-> 3. pri dalsich skuskach zase nepinguje 10.0.0.7

vid 2.

-> L2)
-> # ping 10.0.0.0 (zo stroja 0.6)
-> PING 10.0.0.0 (10.0.0.0): 56 data bytes
-> 64 bytes from 10.0.0.6: icmp_seq=0 ttl=255 time=0.2 ms
-> 64 bytes from 10.0.0.7: icmp_seq=0 ttl=255 time=1.3 ms (DUP!)
-> 64 bytes from 10.0.0.6: icmp_seq=1 ttl=255 time=0.1 ms
-> 64 bytes from 10.0.0.7: icmp_seq=1 ttl=255 time=0.7 ms (DUP!)
-> 64 bytes from 10.0.0.6: icmp_seq=2 ttl=255 time=0.1 ms
-> 64 bytes from 10.0.0.7: icmp_seq=2 ttl=255 time=0.7 ms (DUP!)
-> 64 bytes from 10.0.0.6: icmp_seq=3 ttl=255 time=0.1 ms
-> 64 bytes from 10.0.0.7: icmp_seq=3 ttl=255 time=0.7 ms (DUP!)
-> 
-> preco na seba nema DUP a na 0.7 ma DUP
-> preco nepinguje 10.0.0.1, hoci to ma ako gw

odpovedat na pingy smerovane na "siet" (nie broadcast) zvyknu vyzera to len
linuxy a nie router (alebo to ma zakazane) a nie windowsy (tie ti to
odmietli)

-- 
Matus "fantomas" Uhlar, uhlar na fantomas.sk ; http://www.fantomas.sk/
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