[es] - ping: unknown host, dns ne radi?

Milan Andjelkovic
System Engineer, YUnet International
Beograd

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Profil

ping: unknown host, dns ne radi?

^{10.04.2004. u 11:01}

Modem je externi Diamond SupraExpress 56e PRO, sistem RedHat 9.0, kernel 2.4.20-8

Jedno vreme je sve radilo ok, onda je net počeo da zeza: povežem se najnormalnije, ali uspe samo da se uloguje i protoka uopšte nema. S vremena na vreme primi koji mali paket i to je sve.
Ne sećam se da sam radio išta bitno što je moglo da uzrokuje ove probleme.

Trenutno idem na net preko drugog kompa u mreži (win, ICS).
Evo nekoliko bitnih output-a kad se povežem modemom kod sebe na kompu:

Code:
[root@localhost mangel]# /sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 00:40:05:7A:B3:51
          inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:67081 errors:0 dropped:0 overruns:0 frame:0
          TX packets:65235 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:84711961 (80.7 Mb)  TX bytes:7893117 (7.5 Mb)
          Interrupt:11 Base address:0x2000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:99465 errors:0 dropped:0 overruns:0 frame:0
          TX packets:99465 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4997373 (4.7 Mb)  TX bytes:4997373 (4.7 Mb)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:213.244.194.159  P-t-P:217.26.64.197  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:17 errors:1 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:756 (756.0 b)  TX bytes:84 (84.0 b)

[root@localhost mangel]#

Code:
[mangel@localhost mangel]$ /sbin/route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
217.26.64.197    *               255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
127.0.0.0       *               255.0.0.0       U     0      0        0 lo
default         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
[mangel@localhost mangel]$

Code:
[mangel@localhost mangel]$ ping google.com
ping: unknown host google.com
[mangel@localhost mangel]$ ping 216.239.57.99
PING 216.239.57.99 (216.239.57.99) 56(84) bytes of data.
From 192.168.0.1: icmp_seq=1 Redirect Host(New nexthop: 192.168.0.2)
From 192.168.0.1: icmp_seq=2 Redirect Host(New nexthop: 192.168.0.2)
From 192.168.0.1: icmp_seq=3 Redirect Host(New nexthop: 192.168.0.2)
From 192.168.0.1: icmp_seq=4 Redirect Host(New nexthop: 192.168.0.2)
From 192.168.0.1: icmp_seq=5 Redirect Host(New nexthop: 192.168.0.2)

--- 216.239.57.99 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4045ms

Pre nego što sam podesio mrežu mi je za ping neke javne IP adrese javljao, čini mi se, host unreachable.

E sad, bilo mi je zanimljivo kad sam pingovao veratov server na koji sam se povezao:

Code:
[mangel@localhost mangel]$ ping 217.26.64.197
PING 217.26.64.197 (217.26.64.197) 56(84) bytes of data.
64 bytes from 217.26.64.197: icmp_seq=1 ttl=255 time=208 ms
64 bytes from 217.26.64.197: icmp_seq=2 ttl=255 time=189 ms
64 bytes from 217.26.64.197: icmp_seq=3 ttl=255 time=189 ms
64 bytes from 217.26.64.197: icmp_seq=4 ttl=255 time=169 ms

--- 217.26.64.197 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3028ms
rtt min/avg/max/mdev = 169.971/189.144/208.120/13.498 ms
[mangel@localhost mangel]$

Evo i sadržaja resolv.conf-a (upisani su veratovi dns serveri)

Code:
[mangel@localhost mangel]$ cat /etc/resolv.conf
search localhost
nameserver 217.26.64.130
nameserver 217.26.64.131

Isti je slučaj i ako se povežem preko nekog drugog provajdera.

Ja sam se malo pogubio u celoj priči, pa ako treba nešto da pojasnim ili dodam, samo recite.

Hvala.

ex.mangel

"Sišla je stepeništem kao klavirom."

_{Stay in the house...}

OV SM
LA PK

^{10.04.2004. u 11:01}

Re: ping: unknown host, dns ne radi?

^{11.04.2004. u 11:08}

Evo, uspeo sam da namestim kada sam ručno namestio default gw na adresu veratovog servera na koji sam se povezao:

Code:
[root@localhost mangel]# /sbin/route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
plavi.verat.net *               255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
127.0.0.0       *               255.0.0.0       U     0      0        0 lo
default         plavi.verat.net 0.0.0.0         UG    0      0        0 ppp0

Još samo da provalim zašto kppp neće to da radi automatski...

Ipak, osnovni problem je rešen. Hvala!

ex.mangel

"Sišla je stepeništem kao klavirom."

_{Stay in the house...}

OV SM
LA PK

^{11.04.2004. u 11:08}