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Re: [vox-tech] tight-vnc, can't ping box from windows
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Re: [vox-tech] tight-vnc, can't ping box from windows



So I tried tcpdump(or I should say windump) and couldn't figure out how to get it to work. But no matter I ran ethereal which seems to give the same kinds of info.

Now the question is what am I looking for, I did notice a checksum error (not that I understand what that means) down at the bottom.
104 is the win box and 106 is the linux box...
--------------------------------------
No. Time Source Destination Protocol Info
1 0.000000 192.168.1.104 192.168.1.255 ICMP Echo (ping) reply
2 0.079423 192.168.1.106 Broadcast ARP Who has 192.168.1.104? Tell 192.168.1.106
3 0.079448 Belkin_1d:31:44 192.168.1.106 ARP 192.168.1.104 is at 00:11:50:1d:31:44
4 0.082732 192.168.1.106 192.168.1.104 ICMP Echo (ping) reply
5 0.086566 192.168.1.104 192.168.1.106 ICMP Echo (ping) request
6 5.103971 192.168.1.104 192.168.1.106 ICMP Echo (ping) request
7 6.530434 192.168.1.100 Broadcast ARP Who has 192.168.1.151? Tell 192.168.1.100
8 10.111055 192.168.1.104 192.168.1.106 ICMP Echo (ping) request
9 15.118274 192.168.1.104 192.168.1.106 ICMP Echo (ping) request
----------------------------------------------
No. Time Source Destination Protocol Info
4 0.082732 192.168.1.106 192.168.1.104 ICMP Echo (ping) reply

Frame 4 (104 bytes on wire, 104 bytes captured)
Arrival Time: Jan 26, 2005 23:08:23.438774000
Time delta from previous packet: 0.003284000 seconds
Time since reference or first frame: 0.082732000 seconds
Frame Number: 4
Packet Length: 104 bytes
Capture Length: 104 bytes
Ethernet II, Src: 00:04:5a:5c:0b:3e, Dst: 00:11:50:1d:31:44
Destination: 00:11:50:1d:31:44 (Belkin_1d:31:44)
Source: 00:04:5a:5c:0b:3e (192.168.1.106)
Type: IP (0x0800)
Internet Protocol, Src Addr: 192.168.1.106 (192.168.1.106), Dst Addr: 192.168.1.104 (192.168.1.104)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 90
Identification: 0x004e (78)
Flags: 0x04 (Don't Fragment)
0... = Reserved bit: Not set
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: UDP (0x11)
Header checksum: 0xb622 (correct)
Source: 192.168.1.106 (192.168.1.106)
Destination: 192.168.1.104 (192.168.1.104)
Internet Control Message Protocol
Type: 0 (Echo (ping) reply)
Code: 137
Checksum: 0x0089 (incorrect, should be 0x8503) <----
Identifier: 0x0046
Sequence number: 0x55ae
Data (62 bytes)

0000 80 ff 85 80 00 00 00 01 00 00 00 00 20 45 44 45 ............ EDE
0010 50 46 4a 45 50 46 45 45 46 43 41 43 41 43 41 43 PFJEPFEEFCACACAC
0020 41 43 41 43 41 43 41 43 41 43 41 41 41 00 00 20 ACACACACACAAA..
0030 00 01 00 03 f4 80 00 06 00 00 c0 a8 01 6a .............j

Thanks again for the help,
Alex

PS: I looked at iptables but couldn't quite decipher what I was looking for and nothing stood out as incorrect.

Peter Jay Salzman wrote:
On Wed 26 Jan 05,  6:31 PM, tech_dev <tech_dev@wildintellect.com> said:

Peter Jay Salzman wrote:
...
Use XP to ping Linux again, but this time, use tcpdump to verify that Linux
even sees the icmp packets to begin with.

Pete

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