Wierd DNS(I think) problem
Ed Nowicki
enowicki at ptd.net
Thu Sep 30 18:43:25 UTC 1999
I tried posting the following in comp.os.linux.networking with no success.
Does anyone have any ideas.
Thanks
Ed Nowicki
enowicki at consonance.com
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*Initial Post
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Help!: RH6.0 & pump-0.7.0-1.i386.rpm & DOXport 1000 Cable Modem Problem
<scratch> I'm not sure what to try next, can someone help me?
Configuration:
RH 6.0
eth0: SMC EtherPower 8423BT (tulip) connected to cable modem (using pump)
eth1: SMC EtherPower 8432BT (tulip) connected to LAN (192.168.1.1)
pump-0.7.0-1.i386.rpm installed.
*no* routing or gateway info entered
name resolution search list configured as : hosts then dns
Status:
- ifconf reports vaild Dynamic IP Addr @ eth0 and 192.168.1.1 @ eth0 and
local loopback (looks good)
-eth0 & eth1 interfaces both come up(down) in startup(shutdown).
- can ping to LAN and internet with any valid IP addresses.
- /etc/resolv.conf is seeded with correct Name Server info from DHCP packet
stuff.
Problem:
If i ping or go into netscrape with any URL that begins with www (i.e.
www.dogpile.com) no name resolution occurs (i.e. netscrape times out).
However if I type in (or ping) dogpile.com, I get vaild DNS resolution and
get connected to the server.
Any Ideas what's going on?
Is there something I need with the routing or gateway stuff??
Am I just nutz?
Thanks
enowicki at consonance.com
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* Reply
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> Any Ideas what's going on?
> Is there something I need with the routing or gateway stuff??
I wouldn't think so...
> Am I just nutz?
Sounds likely.... :-)
What does your /etc/resolv.conf file look like after it is built by your
DHCP client?
Have you tried playing around with nslookup to understand what is going
on?
-Tom
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* Reply
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( cat /etc/resolv.conf >> this 2>> thisfile )
search msns.leh.ptd.net leh.ptd.net ptd.net
nameserver 204.186.0.201
nameserver 204.186.0.202
nameserver 24.229.12.230
( nslookup snap.com >> thisfile 2>> thisfile )
Server: dns1.ptd.net
Address: 204.186.0.201
Non-authoritative answer:
Name: snap.com
Addresses: 206.132.166.63, 206.132.166.68, 206.132.166.69, 206.132.166.61
206.132.166.62
( nslookup www.snap.com >> thisfile 2>> thisfile )
Server: dns1.ptd.net
Address: 204.186.0.201
*** dns1.ptd.net can't find www.snap.com: No response from server
( nslookup yahoo.com >> thisfile 2>> thisfile )
Server: dns1.ptd.net
Address: 204.186.0.201
Non-authoritative answer:
Name: yahoo.com
Addresses: 204.71.200.243, 204.71.200.245
( nslookup www.yahoo.com >> thisfile 2>> thisfile )
Server: dns1.ptd.net
Address: 204.186.0.201
*** dns1.ptd.net can't find www.yahoo.com: No response from server
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* Reply
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Pretty amazing. Are you only seeing this from systems in the 192.168.1.0
network or do you see it from the Linux gateway as well? Also, do you
have any firewall rules defined on the gateway?
FWIW, I just connected to dns1.ptd.net and was able to resolve
www.yahoo.com so the problem doesn't occur on that NS.
-Tom
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* Reply
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I issued all commands from the linux console (the one with eth0 & eth1).
I have a dual boot on this computer W95/RH6, in W95 I have no dns problems.
Listed below are some of my network settings. I used a windows utility
(winipcfg) to find my ISPs gateway addr and tried shoving it in the default
gateway setting below.
Any ideas? Do you want to try to telnet to my machine. Thanks for your
help.
Ed Nowicki
717-445-0357
=== Here is some of my network configuration ===
These are my settings (as viewed from 'netconf' ).
*** Basic Host Information ***
Host Name
cnowicki.conson.com
Adapter 1
Enabled
Config mode DHCP
Primary name + domain (empty )
Aliases (empty)
IP address (empty)
Netmask (empty)
Net device eth0
Kernel module tulip
I/O port (empty)
Irq (empty)
Adapter 2
Enabled
Config mode Manual
Primary name + domain cnowicki.conson.com
IP address 192.168.1.1
Netmask 255.255.255.0
Net device eth1
Kernel module tulip
I/O port (empty)
Irq (empty)
Adapter 3-5
*not* enabled
*** Name server specificatioin (DNS)
DNS Usage - DNS is required for normal operation
default domain (empty)
nameserver 1 204.186.0.201
nameserver 2 204.186.0.202
nameserver 3 24.229.12.230
search domain 1 msns.leh.ptd.net
search domain 2 leh.ptd.net
search domain 3 ptd.net
*** Routing and Gateways ***
Set Defaults button - default gateway 24.229.49.1 Enable routing is pushed
on
(note: I manually placed this In here when I found out my ISPs gateway)
Set other routes to networks (empty)
Set other routes to hosts (empty)
Set routes to alternale local nets (empty)
Configure the routed daemon (does no export any routes
*** Host name search path ***
Multiple IPs for one host (pushed on)
hosts, dns (pushed on)
*** Network Information System ***
(empty)
*** IPX interface setup ***
IPX networking (disabled)
*** PPP/SLIP/PLIP ***
One PPP is configured
here is my host.conf file
order hosts, bind
multi on
here is my /etc/hosts file
127.0.0.1 localhost localhost.localdomain
192.168.1.1 cnowicki.conson.com cnowicki
here is my ifconfig output
eth0 Link encap:Ethernet HWaddr 00:00:C0:67:24:E5
inet addr:24.229.49.121 Bcast:255.255.255.255 Mask:255.255.255.0
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:19 errors:0 dropped:0 overruns:0 frame:0
TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0xf480
eth1 Link encap:Ethernet HWaddr 00:E0:29:0D:5C:3A
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:5 Base address:0xf400
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:68 errors:0 dropped:0 overruns:0 frame:0
TX packets:68 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
here is my /proc/interrupts file
CPU0
0: 212809 XT-PIC timer
1: 4368 XT-PIC keyboard
2: 0 XT-PIC cascade
5: 10 XT-PIC eth1
8: 2 XT-PIC rtc
9: 44 XT-PIC eth0
11: 1 XT-PIC cyclomY
12: 31130 XT-PIC PS/2 Mouse
13: 1 XT-PIC fpu
14: 81383 XT-PIC ide0
15: 4 XT-PIC ide1
NMI: 0
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* Reply
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Ed, I'm afraid I'm out of ideas. I don't see anything wrong with your
setup.
You might try posting on comp.protocols.dns to see if anyone there can
help you.
Sorry,
-Tom
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