Alex Samad <[EMAIL PROTECTED]> writes: > On Wed, Jul 23, 2008 at 08:02:58PM +0200, Csanyi Pal wrote: >> Andrew Sackville-West <[EMAIL PROTECTED]> writes: >> >> > On Wed, Jul 23, 2008 at 02:35:31PM +0200, Csanyi Pal wrote: >> >> Andrei Popescu <[EMAIL PROTECTED]> writes: >> >> >> >> > On Wed,23.Jul.08, 13:31:13, Csányi Pál wrote: >> >> >> I have at home a small LAN with Debian GNU/Linux Etch boxes. >> >> >> > [snip] > >> > /sbin/route >> > >> > when executed on the gateway machine. >> >> Kernel IP routing table >> Destination Gateway Genmask Flags Metric Ref Use Iface >> 91.102.231.32 * 255.255.255.240 U 0 0 0 eth2 >> 192.168.2.0 * 255.255.255.0 U 0 0 0 eth1 >> 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 >> default 46-231-102-91.r 0.0.0.0 UG 0 0 0 eth2 > [snip]
> looking at your route table I would suggest something like > > tcpduump -pni eth2 port 53 or host <insert the isps dns ip address here, > the first one in the resolv.conf file> > > this will show you all the packets leaving via eth2 that are on port 53 > (dns) or are destined or have come from you isp's dns server. > > if this is working from the gateway, try it from one of the remote > machines, the tcpdump should be still run on the gateway machine This is working from gateway. I'm trying it from LAN behind the gateway/firewall, from desktop machine. tcpdump now shows traffic, when I ping www.google.com from desktop machine. I run on gateway command: sudo tcpdump -pni eth2 port 53 or host 62.108.117.6 listening on eth2, link-type EN10MB (Ethernet), capture size 96 bytes 09:42:10.158205 IP 91.102.227.98.46197 > 62.108.117.6.53: 1661+ A? www.google.com. (32) 09:42:15.153786 IP 91.102.227.98.50360 > 213.244.255.2.53: 1661+ A? www.google.com. (32) 09:42:20.153200 IP 91.102.227.98.46197 > 62.108.117.6.53: 1661+ A? www.google.com. (32) 09:42:25.152719 IP 91.102.227.98.50360 > 213.244.255.2.53: 1661+ A? www.google.com. (32) 4 packets captured 4 packets received by filter 0 packets dropped by kernel but I get error message on the command line on desktop (LAN): $ ping www.google.com ping: unknown host www.google.com tcpdump now shows traffic, when I 'ping 62.108.117.6' from desktop machine. I run the command on gateway: sudo tcpdump -pni eth2 09:46:56.951551 IP 91.102.227.98 > 62.108.117.6: ICMP echo request, id 63003, seq 10, length 64 09:46:57.083584 IP 91.102.227.98.50927 > 213.244.255.2.53: 58759+[|domain] 09:46:57.951463 IP 91.102.227.98 > 62.108.117.6: ICMP echo request, id 63003, seq 11, length 64 09:46:58.951366 IP 91.102.227.98 > 62.108.117.6: ICMP echo request, id 63003, seq 12, length 64 but at the command line on desktop machine I get nothing: $ ping 62.108.117.6 PING 62.108.117.6 (62.108.117.6) 56(84) bytes of data. Then I cancel it with Ctrl-C: --- 62.108.117.6 ping statistics --- 13 packets transmitted, 0 received, 100% packet loss, time 12008ms Well, I think that that something is wrong in my network setup, but what? -- Regards, Paul Csanyi http://www.freewebs.com/csanyi-pal/index.htm -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
