[EMAIL PROTECTED] said: > Now... all this works in terms of the plumbing but *all* the UMLs have > the same eth device HWAddr (mac address) so they all get the same IP. > > I want them to have different IPs. > > > I thought, because they were all using different tun devices that they > would get different IPs (each of the tun devices in the bridge has a > different HWAddr).
The mac address assigned to the tap device on the host is used by the *host*, not the uml. The mac address used by the guest is the one associated with its ethX device corresponding to the tap device on the host. You can think of a uml guest running with eth0=tuntap as being connected to the host by a "virtual crossover cable": +------------------+ +-----------------+ |host tapN|===|eth0 uml guest| | mac| |mac | | 32:61:ae:6b:a4:05| |fe:fd:00:00:00:02| +------------------+ +-----------------+ > Can someone explain how to make the UML side of the tun devices have > unique HWAddrs? The host tuntap side of the link always gets a random address assigned by a call to random_ether_addr() in tun.c. Unless you somehow specify otherwise, though, the uml side always gets fe:fd:00:00:00:00. As mentioned, you can generate random (unique?) ones yourself, and assign them to the uml on the uml command line using "eth0=tuntap,tap0,fe:fd:00:00:00:02". You can also change the mac address within the uml with "ip link set dev eth0 address fe:fd:00:00:00:02". I think you can do it with ifconfig too. Finally, if you assign an IP to the interface within the UML guest _before_ bringing the interface up, then the last four octets of the mac will be set to match the IP assigned. HTH, Jason ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
