This problem is because isc-dhcp strips the interface alias when it
enumerates the system interfaces, i.e. in common/discover.c function
next_iface():
/* interface aliases look like "eth0:1" or "wlan1:3" */
s = strchr(info->name, ':');
if (s != NULL) {
*s = '\0';
}
However when later searching the previously-enumerated list for the
matching interface for the cmdline interface parameter name, it does not
strip the interface alias from the cmdline interface name, i.e. in
common/discover.c function discover_interfaces():
/* Cycle through the list of interfaces looking for IP addresses. */
while (next_iface(&info, &err, &ifaces)) {
/* See if we've seen an interface that matches this one. */
for (tmp = interfaces; tmp; tmp = tmp->next) {
if (!strcmp(tmp->name, info.name))
break;
}
The 'info' interface will always have its info.name set to the actual interface
name, without any alias extension, while the 'tmp' interface (from the cmdline)
will have its tmp->name set to the interface including alias extension; the
strcmp then never matches, so isc-dhcp is not able to correctly match the
requested interface with the actual system interface.
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https://bugs.launchpad.net/bugs/1693819
Title:
dhclient DHCPv6 does not work with interface alias
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