Beberapa kali saya melakukan hal tersebut.. terkadang ada situs2 yang tampilannya jadi aneh, seperti yahoomail yang blank, ym susah login, facebook harus refresh dan sebagainya..
Usut punya usut, ternyata beberapa situs2 besar seperti facebook,friendster, yahoo dll menaruh cache server di Akamai suatu penyedia jasa layanan Content Delivery Network berbasis DNS. Server-servernya akamai ini terletak di provider sebagai value added service untuk mempercepat loading content (semacam cache).
Karena akamai merupakan fitur ekslusifnya provider, -katakanlah server akamai yang ditaruh di Telkom- maka terkadang, jika kita mengaksesnya dari IP address provider lain, tidak akan bisa diakses. sama seperti halnya DNS server telkom jika diakses dari network ISP lain tidak akan menjawab query.
Mungkin akan lebih jelas jika melihat diagram berikut :
Akamai bekerja berdasarkan DNS, misal begini.. ketika traffic keluar dari IP WISP dan melakukan query dns ke facebook.com dns akan menjawab dengan IP 69.63.189.26 (Facebook US), nah kemudian suatu saat, request DNS muncul dari IP speedy ke facebook.com. karena content facebook untuk telkom telah di provide oleh akamai maka DNS server telkom akan menjawab query facebook.com tersebut dengan ip 125.160.18.26 (Facebook Akamai, server berada di datacenter telkom). nah ketika transmisi data pada router anda yang diberikan rules Pisah IIX internasional ke ip 125.x.x.x melaui gateway WISP, maka traffic ke server facebook akamai tersebut akan direject. So jadinya tampilan nya ngeblank deh. (lihat garis-garis warna merah)
Nah bagaimana menyiasati nya?
saya terfikir untuk me-list network Telkom (dimana Akamai berada) dengan cara melihat Looking Glass diRouter BGP OpenIXP
langkah pertama saya coba mencari router telkom yang terhubung langsung dengan openixp
kemudian setelah ditemukan ip nya yaitu 218.100.27.179 saya kemudian bisa mendapatkan list network yang di routekan via gateway tersebut adalah network milik Telkom.
langkah kedua saya melakukan list semua subnetwork di openixp dengan menggunakan script yang adaDISINI
langkah ketiga, saya lakukan grep untuk subnetwork yang memiliki IP gateway 218.100.27.179
nah, dari list table diatas, kita bisa mengambil hanya network prerfix-nya saja dengan menggunakan script curl dan perl-netmask, dan hasilnya untuk subnet Telkom yang terhubung langsung dengan OpenIXP adalah sebagai berikut :
Code:
61.5.0.0/17 61.94.0.0/16 110.136.0.0/14 110.232.82.0/24 113.11.132.0/24 113.11.155.0/24 113.212.114.0/24 113.212.125.0/24 113.212.126.0/23 114.30.80.0/24 114.30.85.0/24 114.30.86.0/24 117.103.173.0/24 117.103.174.0/24 118.96.0.0/15 118.98.0.0/17 119.252.128.0/23 119.252.131.0/24 119.252.133.0/24 119.252.134.0/24 121.100.19.0/24 121.100.26.0/24 121.101.128.0/21 125.160.0.0/13 146.23.253.0/24 146.23.254.0/24 175.45.184.0/21 175.111.88.0/22 175.111.112.0/21 175.184.248.0/24 180.131.146.0/24 180.240.128.0/17 180.241.0.0/16 180.242.0.0/15 180.244.0.0/14 180.248.0.0/14 180.252.0.0/15 180.254.0.0/16 182.255.0.0/22 192.8.8.0/24 202.43.92.0/22 202.46.24.0/21 202.46.80.0/22 202.46.129.0/24 202.51.56.0/22 202.51.60.0/23 202.52.52.0/24 202.52.58.0/23 202.52.137.0/24 202.58.204.0/22 202.70.132.0/23 202.73.224.0/20 202.133.80.0/20 202.134.0.0/16 202.137.225.0/24 202.137.230.0/24 202.146.137.0/24 202.146.143.0/25 203.99.120.0/24 203.114.224.0/23 203.130.192.0/18 203.189.123.0/24 203.190.50.0/24 203.210.83.0/24 203.217.134.0/23 210.57.208.0/20 218.100.27.179/32 222.124.0.0/16
langkah ke kempat, agar traffic yang menuju network Telkom tidak keluar melewati IP WISP, kita harus memberikan policy routing di MikroTik
ketika dst-address nya ke subnet telkom agar lookup via tabel routing speedy (sesuaikan dengan tabel routing yang anda buat)
Code:
/ip route rule add action=lookup comment="" disabled=no dst-address=61.5.0.0/17 table=via-speedy add action=lookup comment="" disabled=no dst-address=61.94.0.0/16 table=via-speedy add action=lookup comment="" disabled=no dst-address=110.136.0.0/14 table=via-speedy add action=lookup comment="" disabled=no dst-address=110.232.82.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=113.11.132.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=113.11.155.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=113.212.114.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=113.212.125.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=113.212.126.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=114.30.80.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=114.30.85.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=114.30.86.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=117.103.173.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=117.103.174.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=118.96.0.0/15 table=via-speedy add action=lookup comment="" disabled=no dst-address=118.98.0.0/17 table=via-speedy add action=lookup comment="" disabled=no dst-address=119.252.128.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=119.252.131.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=119.252.133.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=119.252.134.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=121.100.19.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=121.100.26.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=121.101.128.0/21 table=via-speedy add action=lookup comment="" disabled=no dst-address=125.160.0.0/13 table=via-speedy add action=lookup comment="" disabled=no dst-address=146.23.253.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=146.23.254.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=175.45.184.0/21 table=via-speedy add action=lookup comment="" disabled=no dst-address=175.111.88.0/22 table=via-speedy add action=lookup comment="" disabled=no dst-address=175.111.112.0/21 table=via-speedy add action=lookup comment="" disabled=no dst-address=175.184.248.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.131.146.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.240.128.0/17 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.241.0.0/16 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.242.0.0/15 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.244.0.0/14 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.248.0.0/14 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.252.0.0/15 table=via-speedy add action=lookup comment="" disabled=no dst-address=180.254.0.0/16 table=via-speedy add action=lookup comment="" disabled=no dst-address=182.255.0.0/22 table=via-speedy add action=lookup comment="" disabled=no dst-address=192.8.8.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.43.92.0/22 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.46.24.0/21 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.46.80.0/22 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.46.129.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.51.56.0/22 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.51.60.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.52.52.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.52.58.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.52.137.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.58.204.0/22 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.70.132.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.73.224.0/20 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.133.80.0/20 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.134.0.0/16 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.137.225.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.137.230.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.146.137.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=202.146.143.0/25 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.99.120.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.114.224.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.130.192.0/18 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.189.123.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.190.50.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.210.83.0/24 table=via-speedy add action=lookup comment="" disabled=no dst-address=203.217.134.0/23 table=via-speedy add action=lookup comment="" disabled=no dst-address=210.57.208.0/20 table=via-speedy add action=lookup comment="" disabled=no dst-address=218.100.27.179/32 table=via-speedy add action=lookup comment="" disabled=no dst-address=222.124.0.0/16 table=via-speedy
last but not least
sebenernya ada cara mudah untuk mencari subnet akamai di telkom,
kita bisa memanfaatkan website looking glass seperti robtex.com dan melakukan search untuk akamai.telkom.net.id
yang sebenarnya hanya ada dua subnet yaitu
125.160.16.0/24
125.160.18.0/24
Search Subnet Akamai
Shared Network/Domain
Demikian sharing oprekan saya kali ini
credit : faisal
