Menggabungkan 2 koneksi Internet

> Jaringan 1 -------------                              ----------------------
> Internet (koneksi 1)
>                               |                               |
>                            Router Linux (4 ethernet card)
>                               |                               |
> Jaringan 2 -------------                              ----------------------
> Internet (koneksi 2)
>
>
> Jaringan 1 secara default menggunakan koneksi internet 1
> Jaringan 2 secara default menggunakan koneksi internet 2
>
> Bisakah Linux Router di setup seperti konfigurasi di atas (dengan menggunakan
> 4 ethernet card)  ?

saya masang 5 ethernet card, no problemo

> Jika memang bisa, apakah dapat juga dibuat agar secara otomatis linux
> mendeteksi terputusnya salah satu koneksi kemudian mengalihkannya ke koneksi
> yang tidak terputus ?

dua kemungkinan:

1. jika kedua upstream provider menyediakan protokol OSPF tinggal setup
OSPFnya (di lapangan jarang ISP menyediakan protokol OSPF ke pelanggan)

2. monitoring koneksi
isp1: pake gw1
isp2: pake gw2

buat script supaya selang waktu tertentu mengecek koneksi
- jika gw1 dan gw2 up, tentukan routing default kemana
- jika gw1 up dan gw2 down, route default ke gw1
- jika gw1 down dan gw2 up, route default ke gw2
- jika gw1 down dan gw2 down, telp kedua ISP tersebut

kelemahan
- jika default gw1, maka downlink dari gw2 kosong, tidak terpakai
meskipun gw2 up
- begitu juga sebaliknya

solusi: load balancing, tapi butuh effort lebih + support dari ISP
(mungkin)
keyword: paket downlink akan mengalir jika source routing sesuai dgn ISP
yang bersangkutan
misal: jika anda mengakses yahoo.com dgn source routing IP ISP1 maka
downlink pasti lewat ISP1, nggak akan lewat ISP2

 trims to : linux-admin

Current state of immunology research in India

Rudimentary studies on aspects of biochemistry in India date back to 1927. But, in the field of Immunology, such studies were started by scholars only during early 1970s at the All India Institute of Medical Sciences, New Delhi, India. Science and Technology was not an immediate priority until 1961 due to domestic and political conditions in the country. We were then 11 years old since independence and our focus was on economic and social developments. Gradually, improvements were made in the field and now we have 15-20 major groups (small in size) of immunologists in the country, who have made significant contribution in the field during the last 8-10 years. Hence, we anticipate improvements in manpower and infrastructure in the near future.