Did you check if you could ping the host machine. If you can, but
can't ping the world, check if your IP Masquerading is on. E.g.

iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE

Jay

On Thu, Apr 17, 2008 at 4:53 PM, Antoine Martin <[EMAIL PROTECTED]> wrote:
> Brendan,
>
> You're not explaining what doesn't work....
> Have you tried pinging, traceroute, tcpdump, etc..
>
> Cheers
> Antoine
>
>
>
>
>
>
> Brendan McNally wrote:
> > Hi All
> >
> > I am having major problems getting my UML sessions networked
> > correctly.  Can someone please review my configuration or suggest a
> > solution?  It's really getting to me!
> >
> > Thanks
> > Brendan
> >
> > Host: 192.168.50.101 <http://192.168.50.101>
> > GW: 192.168.50.1 <http://192.168.50.1>
>
> >
> > Network Setup on hosts;
> > tunctl
> > tunctl -b
> > tunctl -u root -t umlserver
> > tunctl -d tap0
> > ifconfig umlserver 192.168.0.254 <http://192.168.0.254> up
> > route add -host 192.168.0.253 <http://192.168.0.253> dev umlserver
>
> > echo 1 > /proc/sys/net/ipv4/ip_forward
> > echo 1 > /proc/sys/net/ipv4/conf/umlserver/proxy_arp
> > arp -Ds 192.168.0.253 <http://192.168.0.253> eth0 pub
>
> >
> >
> > [EMAIL PROTECTED]:/home/brendan/test# ifconfig -a
> > eth0      Link encap:Ethernet  HWaddr 00:0A:E4:AC:19:57
> >           inet addr:192.168.50.101 <http://192.168.50.101>
> > Bcast:192.168.50.255 <http://192.168.50.255>  Mask:255.255.255.0
> > <http://255.255.255.0>
>
> >           inet6 addr: fe80::20a:e4ff:feac:1957/64 Scope:Link
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:3914 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:4213 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000
> >           RX bytes:320456 (312.9 KB)  TX bytes:631413 (616.6 KB)
> >           Interrupt:20 Base address:0x6000
> >
> > eth1      Link encap:Ethernet  HWaddr 00:14:A5:34:14:26
> >           UP BROADCAST MULTICAST  MTU:1500  Metric:1
> >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:702 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000
> >           RX bytes:0 (0.0 b)  TX bytes:29484 (28.7 KB)
> >           Interrupt:11
> >
> > lo        Link encap:Local Loopback
> >           inet addr:127.0.0.1 <http://127.0.0.1>  Mask:255.0.0.0
> > <http://255.0.0.0>
>
> >           inet6 addr: ::1/128 Scope:Host
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> >           RX packets:328 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:328 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:0
> >           RX bytes:40509 (39.5 KB)  TX bytes:40509 (39.5 KB)
> >
> > tap0      Link encap:Ethernet  HWaddr 00:FF:2E:A0:F3:47
> >           BROADCAST MULTICAST  MTU:1500  Metric:1
> >           RX packets:9 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:500
> >           RX bytes:594 (594.0 b)  TX bytes:0 (0.0 b)
> >
> > tap1      Link encap:Ethernet  HWaddr 00:FF:F4:AA:CA:DE
> >           BROADCAST MULTICAST  MTU:1500  Metric:1
> >           RX packets:9 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:500
> >           RX bytes:594 (594.0 b)  TX bytes:0 (0.0 b)
> >
> > umlserver Link encap:Ethernet  HWaddr 00:FF:7C:1D:9C:82
> >           inet addr:192.168.0.254 <http://192.168.0.254>
> > Bcast:192.168.0.255 <http://192.168.0.255>  Mask:255.255.255.0
> > <http://255.255.255.0>
>
> >           inet6 addr: fe80::2ff:7cff:fe1d:9c82/64 Scope:Link
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:0 errors:0 dropped:35 overruns:0 carrier:0
> >           collisions:0 txqueuelen:500
> >           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
> >
> >
> >
> >
> > Start command;
> > ./vmlinux-server ubda=Fedora7-server_fs mem=128M umid=umlserver
> > eth0=tuntap,tap0
> >
> >
> > Guest Setup;
> > ifconfig eth0 192.168.0.253 <http://192.168.0.253> up
> > route add default gw 192.168.0.254 <http://192.168.0.254>
> >
> >
> >
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