Re: Local Network Problem

Eberhard Roloff wrote:
Don Henson wrote:
To make a long background story short...

In restoring from a major system crash, I ended up with a
server/workstation, a workstation, and a laptop (wifi) that should be
talking to each other over Ethernet. The laptop will not respond to a
ping from anybody and the other two will respond to each other's pings
if I use the domain address. They will not respond if I ping the
corresponding IP address. This seems backwards to me but that's the way
it is. At one point, I had all three machines talking but after
rebooting all three, the problem returned. I've been working on this for
a couple of days and now I find myself thoroughly confused. I have no
idea which files and logs might be useful. If you are interested in
helping, let me know what data you need and I'll post it forthwith. I'd
really appreciate a little help on this one.

Don Henson

on each one:

ifconfig eth0
cat /etc/hosts

then: Do you use a dhcp server for your machines? (For example, your
router could be acting as such a server)

do you use a firewall on all your machines or on specific machines?

What does a packet sniffer, ex. ethereal show on your laptop, when you
try to ping it from another machine.

If you are working with fixed ip addresses, what happes if you connect
only two machines via a crossover cable , i.e. leave out your swith and
anthing else in between.

kind regards
Eberhard


Per your request...

For Earth-svr
dhenson@Earth-svr:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:07:E9:9C:26:0B
inet addr:192.168.1.51 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::207:e9ff:fe9c:260b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1676 errors:0 dropped:0 overruns:0 frame:0
TX packets:1260 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1110628 (1.0 MiB) TX bytes:200677 (195.9 KiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:25 errors:0 dropped:0 overruns:0 frame:0
TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2536 (2.4 KiB) TX bytes:2536 (2.4 KiB)

dhenson@Earth-svr:~$ cat /etc/hosts
# 127.0.0.1 localhost
192.168.1.51 Earth-svr.site Earth-svr localhost
192.168.1.52 Venus-ws.site Venus-ws
192.168.1.53 Mars-laptop.site Mars-laptop

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
dhenson@Earth-svr:~$

For Venus-ws

jhenson@Venus-desktop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:15:F2:5B:9B:10
inet addr:192.168.1.52 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::215:f2ff:fe5b:9b10/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7903 errors:0 dropped:0 overruns:0 frame:0
TX packets:3847 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2013210 (1.9 MiB) TX bytes:332621 (324.8 KiB)
Interrupt:22 Base address:0xe800

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:100 (100.0 b) TX bytes:100 (100.0 b)

jhenson@Venus-desktop:~$ cat /etc/hosts
127.0.0.1 localhost
192.168.1.51 Earth-svr.site Earth-svr
192.168.1.52 Venus-ws.site Venus-ws
192.168.1.53 Mars-laptop.site Mars-laptop

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
jhenson@Venus-desktop:~$

For Mars-laptop

dhenson@Mars-laptop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:19:B9:76:09:3C
inet addr:192.168.1.53 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:21

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:46 errors:0 dropped:0 overruns:0 frame:0
TX packets:46 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4251 (4.1 KiB) TX bytes:4251 (4.1 KiB)

wlan0 Link encap:Ethernet HWaddr 00:19:7E:62:59:16
inet addr:192.168.1.53 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::219:7eff:fe62:5916/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3593 errors:0 dropped:0 overruns:0 frame:0
TX packets:2631 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1442713 (1.3 MiB) TX bytes:244737 (239.0 KiB)
Interrupt:19 Memory:d0200000-d0204000

dhenson@Mars-laptop:~$ cat /etc/hosts
127.0.0.1 localhost
192.168.1.51 Earth-svr.site Earth-svr
192.168.1.52 Venus-ws.site Venus-ws
192.168.1.53 Mars-laptop.site Mars-laptop.site

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
dhenson@Mars-laptop:~$

The original install used DHCP but I am tryng to switch to static.

My Linksys router/switch has a firewall. I use that and my machines have
their firewalls turned off.

I'm afraid that ethereal, now apparently called wireshark, is beyond my
current capabilities. I'm also having trouble getting it downloaded.

I don't have a crossover cable but I'm going to the store tomorrow. I'll
pick one up.

Thanks for offering to help.

Don Henson


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