The Thursday 24 July 2008 09:52:22 Csanyi Pal, you wrote : > 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
When you do a dhclient you get the IP address of the DHCP server which offer you your IP. Could you try a ping on this address and if it works on the DNS address you get in /etc/resolv.conf ? -- Thomas Preud'homme Why debian : http://www.debian.org/intro/why_debian -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
