On Tue, Oct 30, 2007 at 06:05:07AM -0500, Aaron wrote:
quoted text > Stuart Henderson wrote:
>> On 2007/10/29 22:27, Aaron wrote:
>>
>>> I think I have a handle on the lan, dmz interfaces and maybe even the
>>> fxp0 wan interface, but I'm wondering about the san0 interfaces. Can they
>>> be carped? My idea was to run the cable from the telco into a switch/hub
>>> and then carp the san0 interfaces,
>>>
>>
>> No, don't do this. This would be like plugging a phone line and
>> two modems into a switch.
>>
>
> ok, scratch that idea. Are there any csu/dsu units out there that can take
> the incoming t1 signal and then output directly to an ethernet interface on
> the obsd box or do they all have to output via v.35 or 8 position cable to
> a 'standard' router (a'la cisco etc.....) before coming into the openbsd
> machine? Even a cheap router that could do all of the signal conversion
> (I'm looking over adtran's site now...... any recommendations) so that i
> don't need 3 (csu/dsu---router---obsd firewall) machines to terminate the
> t1.
>
>>
>>> Here is what I'm hoping to accomplish in order of priority:
>>>
>>
>> You're describing something which is normally handled by speaking
>> BGP with your provider(s).
>>
>>
> They aren't able to do bgp, as far as I know, as they are getting their
> connections from completely different isps, don't have an AS number and I'm
> not sure if this matters or not but the second wan connection is just 256k
> off of a t1 that provides phone service. That's why I had to play the dns
> short ttl game. Thus far however it has worked fairly well.
>
Have a look at ifstated, you can track the link state with it and switch
between the two links. Then you can demote the carp interface depending on
the link state of the wan link. This will most porbably not work with a
external T1 to ethernet media converter as they do not change the link
state depending on the T1 link. (I never had a lot of success with media
converters anyway, mine always crashed or behaved flaky).
--
:wq Claudio
