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Catatan kecil waktu dulu utak-atik Dynamips. Berhubung dah lama nggak sempet utak-atik lagi, aku catet dulu aja di blog. Biar gak lupa. Sekalian dibuat Tutorial walaupun masih prematur 
Dynamips Tutorial
Merupakan lanjutan dari artikel sebelumnya. Pada artikel sebelumnya, aku baru menginstall dan sekedar coba-coba aja menerapkan Dynamips. Catatan kali ini sedikit lebih dalam mengulas Dynamips, seperti misalnya konfigurasi-konfigurasi penting untuk meningkatkan performa Dynamips.
Kenapa sih?
Inbound ICMP yang lewat PIX otomatis akan di-deny. Outbond ICMP diperbolehkan PIX, tapi echo-reply secara default juga di drop. So kalo ngeping pasti hasilnya RTO.
Versi PIX?
Cisco PIX Firewall Version 6.3(5)
Gimana?
Biar bisa ngeping, dan mungkin untuk keperluan yang lain, begini contoh konfigurasinya:
access-list 102 permit icmp any any echo-reply
access-list 102 permit icmp any any source-quench
access-list 102 permit icmp any any unreachable
access-list 102 permit icmp any any time-exceeded
access-group 102 in interface outside
icmp permit any outside
referensi: http://www.cisco.com/warp/public/110/31.html
Hidupin Cisco 1841, lho koq IOS-nya nggak kebaca!
Boot: cannot open “flash:”
boot: cannot determine first executable file name on device “flash:”
System Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2004 by cisco Systems, Inc.
PLD version 0×10
GIO ASIC version 0×127
c1841 processor with 131072 Kbytes of main memory
Main memory is configured to 64 bit mode with parity disabled
Readonly ROMMON initialized
rommon 1>
Typical configuration (pada Provider Edge) OSPF lewat network VPN MPLS. Diasumsikan disisi provider ada 3 Router PE yaitu: PE A, PE B, PE C, status WAN MPLS dianggap sudah running. Dan sebuah customer bernama Hafidz dengan satu head office dan dua remote, salah satu remote menggunakan akses frame relay, terkoneksi ke WAN MPLS.
Yap, ping! Sederhana, tapi salah satu tool troubleshooting yang cukup membantu, terutama di Cisco Router.
Sekedar catetan, saya ngga’ akan nulis tentang ping itu sendiri, atau tips trobleshooting dengan ping di Cisco, atau penggunaan extended ping, atau debug ip packet, atau traceroute, atau dll. Cuman mau catet karakter-karakter yang keluar dari commnad ping.
- “.” = network server timed out
- “U” = destination unreachable
- “Q” = source quench (destination too busy)
- “M” = could not fragment
- “?” = unknown packet type
- “&” = packet lifetime exceeded
Soalnya pas troubleshoot koneksi antara dua aplikasi database yang sering drop nemuin hasil ping kayak gini:
ROUTER2811#ping 10.6.5.201 re 1000 size 5000
Type escape sequence to abort.
Sending 1000, 5000-byte ICMP Echos to 10.6.5.201, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!QQQQ.!!!!!!!!!!
!!!!!.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!.QQQQQQQQQQQQQQQQQQQ.QQQQ
QQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQ
QQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQ
QQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!
!!!!!.!!!!!!!!!!!!!!!QQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQ
QQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQ
QQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQ
QQQQQQQQQQQQQQQ.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!
!QQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQ
QQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ
.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQ!!!!!!.!!!!!!!!!
!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!QQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ
.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQQQQQQQQQQQ.QQQQQQQQQ
QQQQQQQQQQ.QQQQQQQQQ
Success rate is 26 percent (265/1000), round-trip min/avg/max = 16/19/216 ms
Parah banget 
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( ... jadi inget janji2 PLN..... 
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