I have a problem with internet connectivity. I am a complete newbie :-) there is another person in the house who has had a crack at this and posted a thread with no joy (http://ubuntuforums.org/showthread.php?t=839166) I need a patient person to give me a simple step by step approach to tackling this. I can use terminal and have a basic understanding of how things work, but not much idea of how the networking set up really works.
I noticed the issue a day or so ago, the machine had been running for several days and Firefox open and running fine during that time. Then out of the blue, no other applications could access the net. There were some updates during that period but apart from that I can't see what might have triggered this. No new software installed that I can think of. After a reboot, Firefox could no longer connect normally.
It is an AMD64x2 box running ubuntu 8.04. Its networked (wired D-Link router which has been rebooted) with this laptop on XP and another box running Xbuntu. The other machines have no connectivity issues.
I can ping the other machines no problem, I can ping by IP but not by name. Firefox konqueror or wget will connect to sites using IP address (depending on the site - at least google) but not by name. We can resolve an address with nslookup or dig, ipv4 or ipv6
We have changed the DNS server settings in Network manager (using applet) to the openDNS servers 208.67.222.222
208.67.220.220, to no effect.
From what I've read on similar problems, here's some hopefully relevant info:
Code:$ ifconfig eth0 Link encap:Ethernet HWaddr 00:1d:7d:93:32:e9 inet addr:10.1.1.4 Bcast:10.255.255.255 Mask:255.0.0.0 inet6 addr: fe80::21d:7dff:fe93:32e9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:894 errors:0 dropped:0 overruns:0 frame:0 TX packets:5582 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:119501 (116.7 KB) TX bytes:539627 (526.9 KB) Interrupt:23 Base address:0x2000 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:1605 errors:0 dropped:0 overruns:0 frame:0 TX packets:1605 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:112121 (109.4 KB) TX bytes:112121 (109.4 KB)Code:$ cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 #iface eth0 inet dhcp iface eth0 inet static address 10.1.1.4 netmask 255.0.0.0 gateway 10.1.1.1Code:$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth0 0.0.0.0 10.1.1.1 0.0.0.0 UG 100 0 0 eth0Code:$ cat /etc/resolv.conf nameserver 208.67.222.222 nameserver 208.67.220.220 nameserver 10.1.1.1Would really appreciate some help with this. Pretty much stuck in the mud here :-)Code:$ sudo iptables -L -vnx [sudo] password for rob: Chain INPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT tcp -- * * 208.67.222.222 0.0.0.0/0 tcp flags:!0x17/0x02 109 7703 ACCEPT udp -- * * 208.67.222.222 0.0.0.0/0 0 0 ACCEPT tcp -- * * 208.67.220.220 0.0.0.0/0 tcp flags:!0x17/0x02 0 0 ACCEPT udp -- * * 208.67.220.220 0.0.0.0/0 25 2220 ACCEPT tcp -- * * 10.1.1.1 0.0.0.0/0 tcp flags:!0x17/0x02 0 0 ACCEPT udp -- * * 10.1.1.1 0.0.0.0/0 1605 112121 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 10/sec burst 5 0 0 DROP all -- eth0 * 0.0.0.0/0 255.255.255.255 5845 499482 DROP all -- * * 0.0.0.0/0 10.255.255.255 0 0 DROP all -- * * 224.0.0.0/8 0.0.0.0/0 0 0 DROP all -- * * 0.0.0.0/0 224.0.0.0/8 0 0 DROP all -- * * 255.255.255.255 0.0.0.0/0 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID 0 0 LSI all -f * * 0.0.0.0/0 0.0.0.0/0 limit: avg 10/min burst 5 42 32182 INBOUND all -- eth0 * 0.0.0.0/0 0.0.0.0/0 0 0 LOG_FILTER all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 6 prefix `Unknown Input' Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 10/sec burst 5 0 0 LOG_FILTER all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 6 prefix `Unknown Forward' Chain OUTPUT (policy DROP 1 packets, 140 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT tcp -- * * 10.1.1.4 208.67.222.222 tcp dpt:53 109 7217 ACCEPT udp -- * * 10.1.1.4 208.67.222.222 udp dpt:53 0 0 ACCEPT tcp -- * * 10.1.1.4 208.67.220.220 tcp dpt:53 0 0 ACCEPT udp -- * * 10.1.1.4 208.67.220.220 udp dpt:53 0 0 ACCEPT tcp -- * * 10.1.1.4 10.1.1.1 tcp dpt:53 0 0 ACCEPT udp -- * * 10.1.1.4 10.1.1.1 udp dpt:53 1605 112121 ACCEPT all -- * lo 0.0.0.0/0 0.0.0.0/0 0 0 DROP all -- * * 224.0.0.0/8 0.0.0.0/0 35 3209 DROP all -- * * 0.0.0.0/0 224.0.0.0/8 0 0 DROP all -- * * 255.255.255.255 0.0.0.0/0 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID 5492 455646 OUTBOUND all -- * eth0 0.0.0.0/0 0.0.0.0/0 0 0 LOG_FILTER all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 6 prefix `Unknown Output' Chain INBOUND (1 references) pkts bytes target prot opt in out source destination 42 32182 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 ACCEPT all -- * * 10.1.1.2 0.0.0.0/0 0 0 ACCEPT all -- * * 10.1.1.4 0.0.0.0/0 0 0 LSI all -- * * 0.0.0.0/0 0.0.0.0/0 Chain LOG_FILTER (5 references) pkts bytes target prot opt in out source destination Chain LSI (2 references) pkts bytes target prot opt in out source destination 0 0 LOG_FILTER all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 LOG tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x17/0x02 limit: avg 1/sec burst 5 LOG flags 0 level 6 prefix `Inbound ' 0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x17/0x02 0 0 LOG tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x17/0x04 limit: avg 1/sec burst 5 LOG flags 0 level 6 prefix `Inbound ' 0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x17/0x04 0 0 LOG icmp -- * * 0.0.0.0/0 0.0.0.0/0 icmp type 8 limit: avg 1/sec burst 5 LOG flags 0 level 6 prefix `Inbound ' 0 0 DROP icmp -- * * 0.0.0.0/0 0.0.0.0/0 icmp type 8 0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 5/sec burst 5 LOG flags 0 level 6 prefix `Inbound ' 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 Chain LSO (0 references) pkts bytes target prot opt in out source destination 0 0 LOG_FILTER all -- * * 0.0.0.0/0 0.0.0.0/0 0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 5/sec burst 5 LOG flags 0 level 6 prefix `Outbound ' 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable Chain OUTBOUND (1 references) pkts bytes target prot opt in out source destination 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 65 7184 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 5427 448462 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0
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