On Wed, 22 Oct 2003, Thomas Preissler muttered drunkenly:
> The box itself has correct routing entries. The gateway is the IP of
> the TAP-dev. I have encountered, that the IP does not matter...
> Before starting dhclient I do a "ifconfig eth0 down".
> But when I start "dhclient" on my box, I can't see the
> DHCP-Requests. Then I get "SIOCSIFFLAGS: Protocol driver not
> attached", what is this?
dhclient needs the packet filter and packet socket options
(CONFIG_PACKET and CONFIG_FILTER) enabled.
> The box never gets an IP address from the DHCP server running on the
> host. (box, tap, and host are on the same subnet, of course.)
>
> So, where did I miss something? Is anyone outthere which is using
> DHCP in UML? Can somone give me a hint?
For me, this code (using Alexey Kuznetsov's ip(8) utility rather than
ifconfig and route) brings up the host (edited to remove code that
brings up unrelated interfaces and a second TUN/TAP bridge; I may have
typoed, but I doubt it):
,----
| ip link set eth1 up multicast off txqueuelen 50 mtu 1458 name adsl-phys
|
| tunctl -u firewall >/dev/null # ADSL link (tap0)
| ip link set tap0 mtu 1458 up
|
| brctl addbr adsl
| brctl stp adsl off
| brctl setfd adsl 1
| brctl sethello adsl 1
|
| brctl addif adsl adsl-phys
| brctl addif adsl tap0
|
| ip link set dev adsl mtu 1458 up
|
| # (There is no IP address associated with this link; the host should
| # never need to access it. Should one be needed, code like that below
| # would work.)
|
| # ip addr add 192.168.14.17/24 broadcast 192.168.14.255 dev adsl
`----
And this brings up the link on the UML underneath that (again, trimmed
to remove additional TUN/TAPs, using ip(8)):
,----
| ip link set eth0 name adsl 2>/dev/null
|
| # Kill all existing routes and addresses.
|
| ip route flush dev adsl 2>/dev/null
| ip addr flush dev adsl 2>/dev/null
|
| # Bring up the ADSL-side Ethernet link.
|
| ip link set adsl up multicast on txqueuelen 10 mtu 1458
|
| # Manage it with dhclient.
|
| /usr/sbin/dhclient adsl
`----
I think everything will just work for you once you turn on CONFIG_PACKET
and CONFIG_FILTER, myself.
--
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feeding requests for foreign money-laundering assistance into a human
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