Maskarada mezi dvema linuxy

[Nathan L. Cutler]

Vazeni,

> Zkuste trochu bliz popsat "ani neskrtnu". Mozna pridejte i vypis z
> ifconfigu a route.

Na externi adresy ten klientsky stroj vubec nereaguje. Interni bez
problemu. V logu na serveru vidim napr. pri pokusu o ping na externi adresu
62.24.64.2 nasledujici hlasky:

Sep  3 20:33:37 f216 kernel: Packet log: forward MASQ eth0 PROTO=1
192.168.2.4:8 62.24.64.2:0 L=84 S=0x00 I=143 F=0x0000 T=63 (#1)

Ano, mam "Masquerade ICMP" zapnuto v jadre na serveru. ping na externi
adresy funguje z klientske masiny, ovsem pouze z Voken.

Vypisy z ifconfig a route viz nize.

> Nic zvláštního. Musíte linux klienta zkonfigurovat stejně jako windows.
> Tipoval bych, že máte problém s DNS. Zkuste zkontrolovat, jestli máte v
> /etc/resov.conf platné nameservery. Pokud to bude jiný problém, zkuste
> poslat výstup příkazů ifconfig a route.

bedna:/home/livingston# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:00:E8:56:FB:8A
          inet addr:192.168.2.4  Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:119 errors:0 dropped:0 overruns:0 frame:0
          TX packets:85 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0
          Interrupt:11 Base address:0x6100

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Bcast:127.255.255.255  Mask:255.0.0.0
          UP BROADCAST LOOPBACK RUNNING  MTU:3584  Metric:1
          RX packets:27 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0

bedna:/home/livingston# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        1 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        1 lo
0.0.0.0         192.168.2.1     0.0.0.0         UG    0      0        2 eth0

bedna:/home/livingston# ping 192.168.2.1
PING 192.168.2.1 (192.168.2.1): 56 data bytes
64 bytes from 192.168.2.1: icmp_seq=0 ttl=255 time=0.5 ms
64 bytes from 192.168.2.1: icmp_seq=1 ttl=255 time=0.4 ms
64 bytes from 192.168.2.1: icmp_seq=2 ttl=255 time=0.4 ms

--- 192.168.2.1 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.4/0.4/0.5 ms

bedna:/home/livingston# ping 62.24.64.2
PING 62.24.64.2 (62.24.64.2): 56 data bytes

--- 62.24.64.2 ping statistics ---
8 packets transmitted, 0 packets received, 100% packet loss

62.24.64.2 je nameserver. Uvedeny prikaz "ping 62.24.64.2" funguje bez
problemu ze stejne masiny kdyz ji nabootuju do Windows. Problem DNS to
snad nebude, kdyz nemuzu ani pingnout DNS servery, ani externi adresu sveho
mistniho gatewaye.

Nemate nejake dalsi napady, cim by to mohlo byt? Ted me napadlo, jestli to
nahodou nebude tim, ze v /etc/hosts na serveru a na klientovi mam rozdilne
jmena tech stroju. Ale to snad nema vliv, kdyz zatim testuju pouze IP
adresy...?

-- 
Nathan L. Cutler < livingston @ mbox.dkm.cz >    telephone: +420-2-51611648
Livingston Professional Translations		 fax:       +420-2-6514377
** When "pretty good" is not enough **           mobile:    +420-602-259964