From: Enis Büyükgüner (enis@bantboru.com)
Date: Thu 06 May 2004 - 17:37:08 EEST
Selam arkadaslar
Asagidaki aciklamada anlayamadigim bir yer var da. Rica etsem anlayan biri
beni bilgilendire bilir mi
Anlamadigim konu $P1 ve $P1_NET ipleri. Mesela $P1 Provider 1 in if1 e bakan
bacaginin ip adresi mi?.(192.168.0.2 gibi) eger ogle ise $P1_NET de
255.255.255.0 mi oluyor.
Yardimci olursaniz cok sevinirim.
Herkese iyi calismalar
4.2. Routing for multiple uplinks/providers
A common configuration is the following, in which there are two providers
that connect a local network (or even a single machine) to the big Internet.
________
+------------+ /
| | |
+-------------+ Provider 1 +-------
__ | | | /
___/ \_ +------+-------+ +------------+ |
_/ \__ | if1 | /
/ \ | | |
| Local network -----+ Linux router | | Internet
\_ __/ | | |
\__ __/ | if2 | \
\___/ +------+-------+ +------------+ |
| | | \
+-------------+ Provider 2 +-------
| | |
+------------+ \________
There are usually two questions given this setup.
4.2.1. Split access
The first is how to route answers to packets coming in over a particular
provider, say Provider 1, back out again over that same provider.
Let us first set some symbolical names. Let $IF1 be the name of the first
interface (if1 in the picture above) and $IF2 the name of the second
interface. Then let $IP1 be the IP address associated with $IF1 and $IP2 the
IP address associated with $IF2. Next, let $P1 be the IP address of the
gateway at Provider 1, and $P2 the IP address of the gateway at provider 2.
Finally, let $P1_NET be the IP network $P1 is in, and $P2_NET the IP network
$P2 is in.
One creates two additional routing tables, say T1 and T2. These are added in
/etc/iproute2/rt_tables. Then you set up routing in these tables as follows:
ip route add $P1_NET dev $IF1 src $IP1 table T1
ip route add default via $P1 table T1
ip route add $P2_NET dev $IF2 src $IP2 table T2
ip route add default via $P2 table T2
Enis BÜYÜKGÜNER
IT Chief
Bant Boru San.Tic. A.S.
Tel: 90-216-311 20 50 / 311 20 61
Fax: 90-216-311 83 86
enis <mailto:enis@bantboru.com> @bantboru.com
<http://www.bantboru.com/> www.bantboru.com