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From: Vincenzo Agosto (netstat_at_email.it)
Date: Fri 17 Dec 2004 - 17:47:11 GMT


Herbert Poetzl wrote:
> On Tue, Dec 14, 2004 at 05:45:08PM +0100, Vincenzo Agosto wrote:
>
>>Darryl Ross wrote:
>>
>>>Vincenzo Agosto wrote:
>>>
>>>| and nothing...
>>>| but ping ftp2.it.debian.org is OK
>>>| Some idea?
>>>
>>>I have found that pings always seem to come from the real IP address of
>>>the machine, not the vserver IP address. That would be why the pings work.
>>>
>>>Do you have a firewall rule in place to NAT traffic from the vserver IP
>>>address to the real IP address?
>>>
>>>Regards
>>>Darryl
>>
>>nope, nothing rule
>>
>>iptables -t nat -L
>>Chain PREROUTING (policy ACCEPT)
>>target prot opt source destination
>>
>>Chain POSTROUTING (policy ACCEPT)
>>target prot opt source destination
>>
>>Chain OUTPUT (policy ACCEPT)
>>target prot opt source destination
>
>
> first, the nat table is not relevant for linux-vserver
> as there is nothing to 'forward'.
>
> second as it is very likely a configuration issue, what
> does a tcpdump on the 'host' show, when you do a simple
> connect to a web server (like: telnet google.com 80)
>
If, in my vserver do telnet www.google.com 80 this is the tcpdump

tcpdump: listening on ppp0
18:38:14.626102 82.48.106.27.32769 > 81.74.224.227.domain: 41553+ A?
www.google.akadns.net. (39) (DF)
18:38:14.678478 192.168.1.250.41613 > 66.102.11.99.www: S
3858178163:3858178163(0) win 5808 <mss 1452,sackOK,timestamp 60170371
0,nop,wscale 0> (DF) [tos 0x10]
18:38:17.669087 192.168.1.250.41613 > 66.102.11.99.www: S
3858178163:3858178163(0) win 5808 <mss 1452,sackOK,timestamp 60170671
0,nop,wscale 0> (DF) [tos 0x10]

Appear that the connection start from server to google but nothing
response from google to vserver!

> third, what is your network setup, and what does your
> gateway (router) do/allow?
>
my network setup is
eth0 --> Dynamic ip
eth1 192.168.1.254
eth1:condor: 192.168.1.250

in my vserver I have
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.100.1 * 255.255.255.255 UH 0 0 0 ppp0
192.168.1.0 * 255.255.255.0 U 0 0 0 eth1
default 192.168.100.1 0.0.0.0 UG 0 0 0 ppp0

in my server
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.100.1 * 255.255.255.255 UH 0 0 0 ppp0
localnet * 255.255.255.0 U 0 0 0 eth1
default 192.168.100.1 0.0.0.0 UG 0 0 0 ppp0

best regard
Vincenzo

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