Re: NetBSD come NAT

["Pierluigi M" <mptrax%icerocket.com@localhost>]

Scusa il ritrdo con cui ti rispondo.


> On Wed, Dec 09, 2009 at 06:49:04PM +0100, Pierluigi M wrote:
> > Mi sembra tutto corretto... dove sbaglio ?
> In effetti anche a me. Posta l'output dei seguenti comandi:
> 
>       1) tcpdump -vvvi rtk0 src $IP_CLIENT

19:48:54.609348 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30737, seq 1, length 64
19:48:55.617642 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30737, seq 2, length 64
19:48:56.625567 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30737, seq 3, length 64

>       2) tcpdump -vvvi ex0 src $IP_CLIENT

19:49:46.660258 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30993, seq 8, length 64
19:49:47.668215 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30993, seq 9, length 64
19:49:48.676230 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30993, seq 10, length 64
19:49:49.684175 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30993, seq 11, length 64
19:49:50.649937 arp who-has 192.168.0.10 tell 192.168.0.12
19:49:50.692124 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30993, seq 12, length 64
19:49:51.700134 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP 
(1), length 84) 192.168.0.12 > fe1.avatw.search.vip.ac2.yahoo.com: ICMP echo 
request, id 30993, seq 13, length 64

> 
> Mentre pingi dal client corrispondente a $IP_CLIENT un host sulla 
> rete esterna.
> 

Ho pingato a: 72.30.186.25 Altavista.com (California)

>Col seguente comando, eseguito sul client,
> capiamo anche cosa succede li':
> 
>       tcpdump -vvvi $DEV dst 192.168.0.10
> 
> Dove $DEV corrisponde all'interfaccia di rete collegata allo switch.
>

20:03:53.583498 IP (tos 0x0, ttl 64, id 48111, offset 0, flags [DF], proto TCP 
(6), length 52) 192.168.0.12.33179 > 192.168.0.10.netbios-ssn: ., cksum 0x4711 
(correct), 3153652923:3153652923(0) ack 103234700 win 250 <nop,nop,timestamp 
928645 5162>

Ciò sempre pingando dal medesimo client (da altra console).

Spero di averti dato sufficienti elementi.

Grazie mille.

Pierluigi M.



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