JB <jb.1234abcd <at> gmail.com> writes:
> ....
M1
192.168.1.x/24
eth?
|
=================================================
|
192.168.1.254/24 wireless router
^ ^
^ ^
^ ^(wireless)
^ ^
wlan0:0 en1
192.168.1.108/24 192.168.1.70/24
wlan0 Powerbook (OS/X)
fe80::234::...
Fedora
You said:
Fedora can ping M1 and wireless router.
Powerbook can ping M1 and wireless router.
Fedora and Powerbook can not ping each other.
Fedora has open firewall, Powerbook has no firewall.
------------------
On Fedora Machine:
------------------
# /sbin/ifconfig
...
wlan0 Link encap:Ethernet HWaddr 00:34:56:00:03:43
inet6 addr: fe80::234:56ff:fe00:343/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
...
wlan0:0 Link encap:Ethernet HWaddr 00:34:56:00:03:43
inet addr:192.168.1.108 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
# /bin/netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
...
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
wlan0
...
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0
wlan0
So:
Fedora can ping M1 and wireless router.
I assume via network 192.168.1.0 destination and wlan0.
We do not know anything about M1's eth? interface config and routing table
with regard to IPV4 and/or IPv6, so the analysis will be a bit shallow.
But, the situation is curious, because we have ping's IPv4-format packet with
FROM IPv4 address and TO IPv4 address going out thru IPv6-type interface :-)
The machine does not care, just pushes it out the wire :-) Right ?
The reply will be a IPv4-format packet as well, but will come back to Fedora
on interface that will depend on how M1 routing table is configured (it could
look like Fedora's, or not) ...
NOTE: it would be good to use tcpdump entry, watch both interfaces wlan0 and
wlan0:0 on Fedora, and see on which one the ping's request and reply packets
will be processed.
--------------------
On Powerbook machine
--------------------
# /sbin/ifconfig
...
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.1.70 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:11:24:92:bc:e0
# /sbin/netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.1.254 UGSc 8 0 en1
127 127.0.0.1 UCS 0 0 lo0
127.0.0.1 127.0.0.1 UH 0 4 lo0
169.254 link#6 UCS 0 0 en1
192.168.1 link#6 UCS 2 0 en1
192.168.1.1 0:26:18:6:ef:7 UHLW 0 113 en1 566
192.168.1.60 127.0.0.1 UHS 0 0 lo0
192.168.1.254 0:1d:5a:c8:91:c1 UHLW 15 153 en1 565
So:
Powerbook can ping M1 and wireless router.
I assume via default route and en1, and IPv4.
So, where is the problem with Fedora and Powerbook not being able to see
each other ?
Let's try a ping from Fedora to Powerbook.
Here we do not know everything about Fedora's and Powerbooki's interfaces
config and routing tables with regard to IPV4 and/or IPv6.
After usual shouting who has 192.168.1.70, the Powerbook answers and arp
sets up a IP-to-MAC translation item in its table. All is ready to send
the packet.
But, the situation is curious, because we have ping's IPv4-format packet with
FROM IPv4 address and TO IPv4 address going out thru IPv6-type interface :-)
The machine does not care, just pushes it out the wire :-) Right ?
The reply will be a IPv4-format packet as well, and will come back to Fedora
on interface wlan0:0, which is not the same as IPv4 request's interface IPv6-
type wlan0.
Is here any problem with IPv4, IPv6, and interfaces mismatch ? Routing table
misconfiguration in Fedora (IPv4-type IPs vice IPv6-type interfaces) ?
NOTE: it would be good to use tcpdump entry, watch both interfaces wlan0 and
wlan0:0 on Fedora, and see on which one the ping's request and reply packets
will be processed.
Btw:
- have you tried a different machine in place of that Powerbook ?
- with regard to layer-2 "ping" tool not functioning
There is a possibility to use arp-poisoning tool to manufacture layer 2
frames with MAC headers you specify.
You will probably not get an "echo" back, but if you put a sniffer on
the far segment, you should be able to determine whether your manufactured
frames make it to the other side.
http://www.mail-archive.com/cisco@xxxxxxxxxxxxxx/msg79833.html
JB
Maria Callas - "Violetta Aria" - La Traviata
http://www.youtube.com/watch?v=hv5hCEf8qSw
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