On Thu, Jun 06, 2013 at 07:09:05PM -0400, gpon...@spamcop.net wrote:
> I recently updated from 5.2 to 5.3 and one ethernet port got broken.
> The port connected to a cable modem and was configured for DHCP.
> With 5.3, the DHCP assigned address is getting lost when I add an
> alias.

Mixing dhcp and aliases is not supported in 5.3 as we search for a
consistant and reliable way to accomplish it. dhclient will always
remove all addresses present on the interface when applying the
lease.

.... Ken

>        The alias and a route table addition give the LAN a way to
> communicate with the modem's web interface which is fixed at
> 192.168.100.1. My hostname.em2 contents are:
> 
> dhcp rdomain 1
> alias 192.168.100.2 255.255.255.0
> !route -T 1 add 192.168.100.0/24 192.168.100.2
> 
> I also have a DSL modem on em1 with fixed IP that should not be
> affected by the DHCP response, so my implementation used a separate
> routing table for the two WAN ports.
> 
> /etc >> sh /etc/netstart em2
> 
> DHCPREQUEST on em2 to 255.255.255.255 port 67
> DHCPACK from 73.70.192.1 (00:01:5c:33:0e:01)
> bound to 98.207.205.23 -- renewal in 5572 seconds.
> route: writing to routing socket: File exists
> add net 192.168.100.0/24: gateway 192.168.100.2: File exists
> 
> 
> /etc >> ifconfig em2
> em2: 
> flags=28b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST,NOINET6>
> rdomain 1 mtu 1500
>         lladdr 00:24:81:7f:ee:0b
>         priority: 0
>         media: Ethernet autoselect (1000baseT full-duplex,master)
>         status: active
>         inet 192.168.100.2 netmask 0xffffff00 broadcast 192.168.100.255
> /etc >>
> 
> I would have expect to see two inet lines, one with the DHCP
> assigned address and another with the alias. As it is, the LAN can't
> get to the cable modem and the LAN can't route through the
> DHCP-assigned gateway. Removing the alias solves the routing problem
> but not the cable modem management access. Any thoughts or
> suggestions for how to fix this, or an alternate solution ?
> 
> GP

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