Date: Thu, 23 Jul 2009 20:52:15 +0300 From: Nikos Vassiliadis <nvass9573@gmx.com> To: Michelle Konzack <bsd4michelle@tamay-dogan.net> Cc: freebsd-isp@freebsd.org, freebsd-questions@freebsd.org Subject: Re: PPPoE server (high traffic in WDM network) Message-ID: <4A68A34F.5040400@gmx.com> In-Reply-To: <20090715184054.GD29667@tamay-dogan.net> References: <20090715184054.GD29667@tamay-dogan.net>
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> Hello Nikos, Hi, I just saw your answer while browsing. I am not on isp@... Please CC questions@. > Am 2009-07-16 12:27:06, schrieb Nikos Vassiliadis: >> Michelle Konzack wrote: >>> I am ongoing to install a CWDM (1GE) and DWDM (10GE) network for the >>> Alvarion BreezeACCESS VL (38 base stations) and more then 200 Iskratel >>> FTTH DSLAMS of 96 ports (each with 100MBit, but only one 1GE Upstream) >>> each. >> >> So, you'll have 96*200 possible PPP clients. How many concurrent PPP >> sessions do you care to support? >> And more importantly, how much aggregate bandwidth? > > Because the customers are permanently On-Line du to the VoIP-Telephone, > we count with the full number of clients... > > The distance between the FTTH DSLAM and the customers can be up to 10km. > > The idea is now, that we do not simply connect the FTTH DSLAM's to the > CISCO switches but building a redunant Ethernet Carrier Network. > > This mean, we can install in each village there own FTTH DSLAM even if > there are 2500 hausholds and we install 26 FTTH DSLAM's there. > > This mean in theorie 250 GBit Customer Downstream, 26 Gbit Upstream but > we count with a 10 GE which is maybe used to 30-50%. > > OK, if we switch to an "Ethernet Carrier Network" I could install one or > two PPPoE Servers in each village. But if one goes down, the second has > to handel 2500 client connections. I *think* the number of clients is doable. I don't know about the bandwidth. > Note: This is ONLY the base installation between Kehl, Rheinau, > Renchen and Oberkirch (arround 35.000 hausholds) and the > whole region has 150.000 hausholds. > >> Don't understand what you mean round-robin and loadbalancing? >> Read below. > <snip> >> FreeBSD has a RADIUS library in base. The two notable users of libradius >> are ppp and net/mpd. The only choice in a ISP environment I think is the >> net/mpd5 port. Read the outline here: >> http://www.freebsd.org/cgi/url.cgi?ports/net/mpd5/pkg-descr >> >> It is very good and is actually used in large setups. > > Thankyo for the link, I will red on if I am in Office... > >> Can't reply, but keep in mind that filling a 10GE pipe is >> a hard task on its own. > > It depends on how many customers you have and with an Internet access of > 100 Mbit plus services like IPTV and VOD you can fill up a 10 GE pipe. I meant "filling a 10 Gbit pipe with a general purpose computer architecture is a hard task". Packet forwarding at these rates is tricky. >> I *think* having more low fidelity BRASs, will serve your >> needs better that a few high fidelity ones. > > You mean, putting a bunch of small 1U Servers into a 19" 42RU? Yes, you may find that having two small boxes instead of bigger one gives better results performance-wise. You also have to test if SMP helps and how much. A beast with 16 cores is more powerful from a regular computer with 2 cores, but does it help in your setup? >> You can try NanoBSD and TinyBSD which are FreeBSD based and I >> believe can fit the bill. These two run with their filesystems >> read-only mounted which is ideal for flash memories. > > Can you recomment it for an ISP setup? It's FreeBSD running from a read-only mounted medium. No more, no less. Yes, it's fine for an ISP setup. > > Hmmm, I am right, that NanoBSD can be bootup over network? > (this would be another solution) NanoBSD is meant to run in embedded stand-alone devices. So, I *guess* that is conceptually very far from net booting. Nikos
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