[plug] Misconfiguration on server tcp/routing

[Peter]

Lucas van Staden wrote:
> Hello.
>
> I have found an odd problem on my webserver box (use purely to just 
> host my own two personal websites)
>
> I cannot seem to ping certain addresses, but browsing them from links, 
> works fine.
> Some work fine.
> For the life of me I cannot find what is wrong.
> Other machines on this network works fine.
> I am sure it is something obvious, but I just can't see it.
>
> web at webserver:~$ ping www.google.com
> PING www.l.google.com (66.102.11.104) 56(84) bytes of data.
> From 192.168.0.6 icmp_seq=1 Destination Port Unreachable
>
> (takes about 1-2 minutes for that response, and for each thereafter)
>
> Network setup:
>
> auto eth1
> iface eth1 inet static
>    address 192.168.0.6
>    netmask 255.255.255.0
>    gateway 192.168.0.1
>    network 192.168.0.0
>    broadcast 192.168.0.255
>
> web at webserver:~$ sudo route -n
> [sudo] password for web:
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    
> Use Iface
> 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        
> 0 eth1
> 0.0.0.0         192.168.0.1     0.0.0.0         UG    100    0        
> 0 eth1
>
> web at webserver:~$ sudo ifconfig
> eth1      Link encap:Ethernet  HWaddr 00:13:8f:a3:cd:e1          inet 
> addr:192.168.0.6  Bcast:192.168.0.255  Mask:255.255.255.0
>          inet6 addr: fe80::213:8fff:fea3:cde1/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:13720 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:18280 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:4039608 (4.0 MB)  TX bytes:16416771 (16.4 MB)
>          Interrupt:20 Base address:0xd800
>
> 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:434 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:434 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:65165 (65.1 KB)  TX bytes:65165 (65.1 KB)
>
> web at webserver:~$ traceroute www.google.com
> traceroute to www.google.com (66.102.11.104), 30 hops max, 40 byte 
> packets
> 1   (192.168.0.6)  0.090 ms  0.038 ms  0.034 ms
>
> Does not go any further
>
> I new d-link modem/router has been put in use, and I am unsure if this 
> issue existed before then.
>
> Routing on the router:
>
> # route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    
> Use Iface
> 203.59.14.16    203.59.48.28    255.255.255.255 UGH   0      0        
> 0 ppp0
> 203.59.14.16    0.0.0.0         255.255.255.255 UH    0      0        
> 0 ppp0
> 203.59.48.28    127.0.0.1       255.255.255.255 UGH   0      0        
> 0 lo
> 192.168.0.0     192.168.0.1     255.255.255.0   UG    0      0        
> 0 br0
> 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        
> 0 br0
> 239.0.0.0       0.0.0.0         255.0.0.0       U     1      0        
> 0 br0
> 0.0.0.0         203.59.14.16    0.0.0.0         UG    0      0        
> 0 ppp0
>
>
> What could be wrong?
>
Hi Lucas,

Looks like a DNS issue to me.  Is the server running DNS (bind)?  Do you 
have another DNS server on your network or is your modem/router 
configured to  supply DNS info?

What are the DNS settings you are using on the server (Network 
Manager?)....   Auto or manual DNS?

What does /etc/resolv.conf look like?

-Peter.