From: Kivanc Oskay (koskay@cozumbilgisayar.com.tr)
Date: Thu 06 May 2004 - 17:58:15 EEST
selam,
evet aynen oyle,
"$P1_NET", "$IF1" interface.inin subneti, "$IP1" ise ayni interface.in
ip adresi
Kivanc Oskay
System Support Specialist
Cozum Bilgisayar Ltd.
Tel: +90 212 274 7877
Fax: +90 212 274 8056
koskay@cozumbilgisayar.com.tr
-----Original Message-----
From: linux-network-bounce@liste.linux.org.tr
[mailto:linux-network-bounce@liste.linux.org.tr] On Behalf Of Enis
B=FCy=FCkg=FCner
Sent: Thursday, May 06, 2004 5:37 PM
To: LKD E-posta Listecisi
Subject: [linux-network] split access konusunda anlayamadigim bir konu
Selam arkadaslar=20
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Asagidaki aciklamada anlayamadigim bir yer var da. Rica etsem anlayan
biri
beni bilgilendire bilir mi
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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.
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Yardimci olursaniz cok sevinirim.
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Herkese iyi calismalar
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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.
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________
+------------+ /
| | |
+-------------+ 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.=20
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.=20
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
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Enis B=DCY=DCKG=DCNER
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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
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