Thu, Jul 06, 2006 at 09:02:47PM -0500, Jacob Yocom-Piatt wrote:
(1) i have 2 blocks of 8 static IPs at my disposal, one at home and one at work,

So two /29's ?

and both connections are 3Mb/512Kb ADSL via PPPoE. the upstream traffic at work
is beginning to saturate the connection and i would like to share some of the
load with the home connection. would BGP allow me to multihome a site across
both connections to split the load?

would i need an AS number if this would work?

Yup. That's not all. You need at least a /20 (AFAIK) to be able for large
backbones to even consider routing your advertisement. But this was heresay
years ago, I don't know if it still holds. The investment though is in the
thousands of dollars a year though (ARIN fees ) and you have to justify using that much IP space.

(2) are there any particular online docs that are recommended reading for BGP?
RFC's, NANG archives perhaps too

what about books?

(3) the home gateway machine is a PII-350 w/ 64MB ram. is this too slow for
doing what i have asked about in (1)?

Dunno. I suspect you won't be able to load a full BGP table. BGP is really
a big boys(tm) protocol not sure if 2 ADSL connection classifies you as that.
If it did then they would quickly run out of the 16 bit ASN space wouldn't
you think?

Perhaps considering a protocol like CARP is more what you want?
-peter

07/07/06, Peter Philipp <peter_philipp (AT) freenet (DOT) dewrote:

Thu, Jul 06, 2006 at 09:02:47PM -0500, Jacob Yocom-Piatt wrote:
(1) i have 2 blocks of 8 static IPs at my disposal, one at home and one
at work,

So two /29's ?

and both connections are 3Mb/512Kb ADSL via PPPoE. the upstream traffic
at work
is beginning to saturate the connection and i would like to share some
of the
load with the home connection. would BGP allow me to multihome a site
across
both connections to split the load?

would i need an AS number if this would work?

Yup. That's not all. You need at least a /20 (AFAIK) to be able for
large
backbones to even consider routing your advertisement. But this was
heresay
years ago, I don't know if it still holds. The investment though is in
the
thousands of dollars a year though (ARIN fees
) and you have to justify
using that much IP space.

/24 work fine across the net. Smaller than that will likely be filtered in
lots of places.

You need an AS of your own and provider independent addresses to
multihome properly. If both links go to the same provider and they're
flexible
you may be able to implement a bgp setup with your /29's and without an AS
of your own.

In the end complexity and cost of running a bgp setup will hurt a lot more
than just upgrading your bandwidth. With BGP you can connect to multiple
providers, and also inheret problems from all of them.

(2) are there any particular online docs that are recommended reading for
BGP?
RFC's, NANG archives perhaps too

Goto Cisco's website and dig around, they have lots of good documentation
regarding most flavors of ip routing.
#wp4050

what about books?

Internet Routing Architetures by Sam Halabi.
2nd edition for $39 on amazon.

(3) the home gateway machine is a PII-350 w/ 64MB ram. is this too slow
for
doing what i have asked about in (1)?

With more memory it could in theory do what you want,
but in reality BGP is not the tool to use to when you run out
bandwidth on your 0.5M dsl line.

/Tony

* Peter Philipp <peter_philipp (AT) freenet (DOT) de[2006-07-07 08:47]:
would i need an AS number if this would work?

Yup. That's not all. You need at least a /20 (AFAIK) to be able for large
backbones to even consider routing your advertisement. But this was heresay
years ago, I don't know if it still holds.

no.
more than half the table is /24s and /23s.

(3) the home gateway machine is a PII-350 w/ 64MB ram. is this too slow for
doing what i have asked about in (1)?
Dunno. I suspect you won't be able to load a full BGP table. BGP is really
a big boys(tm) protocol not sure if 2 ADSL connection classifies you as that.
If it did then they would quickly run out of the 16 bit ASN space wouldn't
you think?

foremost, running bgp requires your upstreams speaking bgp with you. in
general, DSL companies don't do that.

Thu, Jul 06, 2006 at 09:02:47PM -0500, Jacob Yocom-Piatt wrote:
| i've started doing some background reading on how BGP works and am adrift in
a
| sea of acronyms. i'm confident that i'll learn how to swim, but there are a
few
| questions that i'd like answers to before i make the time investment to
learn
| more. boolean answers are acceptable, more information wouldn't hurt
though.
|
| (1) i have 2 blocks of 8 static IPs at my disposal, one at home and one at
work,
| and both connections are 3Mb/512Kb ADSL via PPPoE. the upstream traffic at
work
| is beginning to saturate the connection and i would like to share some of
the
| load with the home connection. would BGP allow me to multihome a site
across
| both connections to split the load?
|
| would i need an AS number if this would work?

Generally, BGP is used to serve a set of IP addresses over multiple
links two one location. You have two different sets of IP addresses
and two links to two different locations, this smells like trouble.

| (2) are there any particular online docs that are recommended reading for
BGP?

The RFC (I think it's 1771) is very good, check it out.

| what about books?

Try 'Reilly's book by Iljitsch van Beijnum, BGP (ISBN: 0596002548).

| (3) the home gateway machine is a PII-350 w/ 64MB ram. is this too slow for
| doing what i have asked about in (1)?

Seems to be a bit low on RAM, but for just two /29's it would suffice.
At a pervious company we used to setup BGP over private AS'es to
customers who wanted a failover internet connection. If you don't get
a full feed, but just part of the IP space your provider has allocated
to you, this works very well indeed. You give them your /29's, they
give you a /0. Your machine would be very capable of handling such BGP
sessions and the traffic 2 DSL lines can generate. The good thing is
that you don't need your own (public) ASN and that your /29's will not
be filtered by just about every ISP on the planet. The downside is
that you have to get your IP space from one ISP and this ISP has to
cooperate in your little BGP scheme. This is usually not very easy
with your average consumer ISP.

In your situation, you may be better off using multiple A records in
DNS, one to your office location and the other to your home location.
Note that this does not gracefully failover when one of the two DSL
connections fail for whatever reason. Maybe you can do very evil stuff
with tunneling and bridging and carp and bgp, but that's too
disgusting for me to think about ;)

Cheers,

Paul 'WEiRD' de Weerd