On Sat, Feb 21, 2015 at 11:52 PM, Walter Dnes <waltd...@waltdnes.org> wrote:
> My DSL router modem is at 192.168.123.254. I have an HDHomerun > network TV tuner that insists on coming up somewhere in the 169.254.X.Y > block. Up until upgrading from 32 to 64 bits, I was able to see a 2nd > eth0 (i.e. eth0:1) using the following /etc/conf.d/net setup... > > config_eth0=" > 192.168.123.251/29 broadcast 192.168.123.255 > 169.254.1.1/16 broadcast 169.254.255.255" > routes_eth0=" > default via 192.168.123.254 metric 20 > 192.168.123.248/29 via 192.168.123.254 metric 0 > 169.254.0.0/16 via 169.254.1.1 metric 0" > > The 2nd interface is no longer being set up. As amatter of fact, it > appears to be totally unavailable. E.g.... > > [d531][root][~] /etc/init.d/net.eth0 stop > * Unmounting network filesystems ... [ > ok ] > * Bringing down interface eth0 > [d531][root][~] ifconfig eth0:0 192.168.123.251/29 broadcast 192.168.123.255 > SIOCSIFNETMASK: Cannot assign requested address You cannot bring up an ip alias if the "base" ip address isn't set. > [d531][root][~] ifconfig eth0 192.168.123.251/29 broadcast 192.168.123.255 > [d531][root][~] > > So my system doesn't support even the concept of an alias for eth0. > Looking at the ifconfig manpage... > > interface > The name of the interface. This is usually a driver name fol- > lowed by a unit number, for example eth0 for the first Ethernet > interface. If your kernel supports alias interfaces, you can > specify them with eth0:0 for the first alias of eth0. You can > use them to assign a second address. To delete an alias inter- > face use ifconfig eth0:0 down. Note: for every scope (i.e. same > net with address/netmask combination) all aliases are deleted, > if you delete the first (primary). > > I see "If your kernel supports alias interfaces". During the > upgrade, I built the kernel from square 1. I already ran into problems > with not enabling FUSE in the new kernel, which killed MTP until I > enabled it. I wouldn't be surprised if I've disabled some kernel > parameter which is required to enable interface aliases. I didn't see > anything obvious in "make menuconfig". A Google search turned up a > gazillion examples of "how to create an alias using ifconfig". That's > not what I want. I want the kernel setting that allows creating alias > interfaces. CONFIG_IP_ALIAS was dropped with v2.4 >From 2.2 alias.txt: For IP aliasing you must have IP_ALIAS support included by static linking. >From 2.4 alias.txt: IP-aliases are additional IP-adresses/masks hooked up to a base interface by adding a colon and a string when running ifconfig. This string is usually numeric, but this is not a must. IP-Aliases are avail if CONFIG_INET (`standard' IPv4 networking) is configured in the kernel. >From 3.19 alias.txt: IP-aliases are an obsolete way to manage multiple IP-addresses/masks per interface. Newer tools such as iproute2 support multiple address/prefixes per interface, but aliases are still supported for backwards compatibility.
