IPv6 Debugging: Contoh untuk tcpdump paket dump: Difference between revisions

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New page: 14.2. Examples for tcpdump packet dumps Here some examples of captured packets are shown, perhaps useful for your own debugging... ...more coming next... 14.2.1. Router discovery 14.2.1....
 
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14.2. Examples for tcpdump packet dumps
Berikut adalah beberapa contoh hasil capture paket,
barangkali akan bermanfaat saat melakukan debugging.


Here some examples of captured packets are shown, perhaps useful for your own debugging...


...more coming next...
==Menemukan (discovery) Router==
14.2.1. Router discovery
14.2.1.1. Router advertisement


15:43:49.484751 fe80::212:34ff:fe12:3450 > ff02::1: icmp6: router
===Router advertisement===
¬ advertisement(chlim=64, router_ltime=30, reachable_time=0,
¬ retrans_time=0)(prefix info: AR valid_ltime=30, preffered_ltime=20,
¬ prefix=2002:0102:0304:1::/64)(prefix info: LAR valid_ltime=2592000,
¬ preffered_ltime=604800, prefix=2001:0db8:0:1::/64)(src lladdr:
¬ 0:12:34:12:34:50) (len 88, hlim 255)


Router with link-local address “fe80::212:34ff:fe12:3450” send an advertisement to the all-node-on-link multicast address “ff02::1” containing two prefixes “2002:0102:0304:1::/64” (lifetime 30 s) and “2001:0db8:0:1::/64” (lifetime 2592000 s) including its own layer 2 MAC address “0:12:34:12:34:50”.
15:43:49.484751 fe80::212:34ff:fe12:3450 > ff02::1: icmp6: router
14.2.1.2. Router solicitation
¬ advertisement(chlim=64, router_ltime=30, reachable_time=0,
¬ retrans_time=0)(prefix info: AR valid_ltime=30, preffered_ltime=20,
¬ prefix=2002:0102:0304:1::/64)(prefix info: LAR valid_ltime=2592000,
¬ preffered_ltime=604800, prefix=2001:0db8:0:1::/64)(src lladdr:
¬ 0:12:34:12:34:50) (len 88, hlim 255)


15:44:21.152646 fe80::212:34ff:fe12:3456 > ff02::2: icmp6: router solicitation
Router dengan link-local address “fe80::212:34ff:fe12:3450” mengirimkan advertisement ke all-node-on-link multicast address “ff02::1” berisi dua prefix “2002:0102:0304:1::/64” (lifetime 30 detik) dan “2001:0db8:0:1::/64” (lifetime 2592000 detik) termasuk including 2 MAC address-nya “0:12:34:12:34:50”.
¬ (src lladdr: 0:12:34:12:34:56) (len 16, hlim 255)


Node with link-local address “fe80::212:34ff:fe12:3456” and layer 2 MAC address “0:12:34:12:34:56” is looking for a router on-link, therefore sending this solicitation to the all-router-on-link multicast address “ff02::2”.
===Router solicitation===
14.2.2. Neighbor discovery
14.2.2.1. Neighbor discovery solicitation for duplicate address detection


Following packets are sent by a node with layer 2 MAC address “0:12:34:12:34:56” during autoconfiguration to check whether a potential address is already used by another node on the link sending this to the solicited-node link-local multicast address.
15:44:21.152646 fe80::212:34ff:fe12:3456 > ff02::2: icmp6: router solicitation
¬ (src lladdr: 0:12:34:12:34:56) (len 16, hlim 255)


    Node wants to configure its link-local address “fe80::212:34ff:fe12:3456”, checks for duplicate now
Node dengan link-local address “fe80::212:34ff:fe12:3456” dan layer 2 MAC address “0:12:34:12:34:56” sedang mencari router on-link, oleh karenanya mengirimkan solicitation ke all-router-on-link multicast address “ff02::2”.


15:44:17.712338 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
==Penemuan (discovery) Neighbor==
¬ fe80::212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32, hlim 255)


    Node wants to configure its global address “2002:0102:0304:1:212:34ff:fe12:3456” (after receiving advertisement shown above), checks for duplicate now
===Neighbor discovery solicitation untuk deteksi address ganda / duplikat===


15:44:21.905596 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
Paket berikut dikirim oleh sebuah node dengan layer 2 MAC address “0:12:34:12:34:56” saat autokonfigurasi untuk mencek apakah ada address yang sudah digunakan oleh node lain di jaringan. Hal ini dilakukan dengan mengirim ke solicited-node link-local multicast address.
¬ 2002:0102:0304:1:212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32,
¬ hlim 255)


    Node wants to configure its global address “2001:0db8:0:1:212:34ff:fe12:3456” (after receiving advertisement shown above), checks for duplicate now
Node ingin mengkonfigurasi link-local address “fe80::212:34ff:fe12:3456”, cek apakah ada yang menggunakan


15:44:22.304028 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
15:44:17.712338 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
¬ 2001:0db8:0:1:212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32, hlim
¬ fe80::212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32, hlim 255)
¬ 255)


14.2.2.2. Neighbor discovery solicitation for looking for host or gateway
Node ingin mengkonfigurasi global addressnya “2002:0102:0304:1:212:34ff:fe12:3456” (setelah menerima advertisement di atas), cek apakah ada duplikasi


    Node wants to send packages to “2001:0db8:0:1::10” but has no layer 2 MAC address to send packet, so send solicitation now
15:44:21.905596 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
¬ 2002:0102:0304:1:212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32,
¬ hlim 255)


13:07:47.664538 2002:0102:0304:1:2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6:
Node ingin mengkonfigurasi global address “2001:0db8:0:1:212:34ff:fe12:3456” (setelah menerima advertisement di atas), cek apakah ada duplikasi
¬ neighbor sol: who has 2001:0db8:0:1::10(src lladdr: 0:e0:18:90:92:5) (len 32,
¬ hlim 255)


    Node looks for “fe80::10” now
15:44:22.304028 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
¬ 2001:0db8:0:1:212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32, hlim
¬ 255)


13:11:20.870070 fe80::2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6: neighbor
===Neighbor discovery solicitation untuk mencari for host atau gateway===
¬ sol: who has fe80::10(src lladdr: 0:e0:18:90:92:5) (len 32, hlim 255)
 
Node ingin mengirim paket ke “2001:0db8:0:1::10” tapi tidak punya layer 2 MAC address untuk mengirimkan paket, oleh karenanya mengirimkan solicitation
 
13:07:47.664538 2002:0102:0304:1:2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6:
¬ neighbor sol: who has 2001:0db8:0:1::10(src lladdr: 0:e0:18:90:92:5) (len 32,
¬ hlim 255)
 
Node mencari “fe80::10”
 
13:11:20.870070 fe80::2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6: neighbor
¬ sol: who has fe80::10(src lladdr: 0:e0:18:90:92:5) (len 32, hlim 255)

Latest revision as of 02:52, 9 July 2013

Berikut adalah beberapa contoh hasil capture paket, barangkali akan bermanfaat saat melakukan debugging.


Menemukan (discovery) Router

Router advertisement

15:43:49.484751 fe80::212:34ff:fe12:3450 > ff02::1: icmp6: router
¬ advertisement(chlim=64, router_ltime=30, reachable_time=0,
¬ retrans_time=0)(prefix info: AR valid_ltime=30, preffered_ltime=20,
¬ prefix=2002:0102:0304:1::/64)(prefix info: LAR valid_ltime=2592000,
¬ preffered_ltime=604800, prefix=2001:0db8:0:1::/64)(src lladdr:
¬ 0:12:34:12:34:50) (len 88, hlim 255)

Router dengan link-local address “fe80::212:34ff:fe12:3450” mengirimkan advertisement ke all-node-on-link multicast address “ff02::1” berisi dua prefix “2002:0102:0304:1::/64” (lifetime 30 detik) dan “2001:0db8:0:1::/64” (lifetime 2592000 detik) termasuk including 2 MAC address-nya “0:12:34:12:34:50”.

Router solicitation

15:44:21.152646 fe80::212:34ff:fe12:3456 > ff02::2: icmp6: router solicitation
¬ (src lladdr: 0:12:34:12:34:56) (len 16, hlim 255)

Node dengan link-local address “fe80::212:34ff:fe12:3456” dan layer 2 MAC address “0:12:34:12:34:56” sedang mencari router on-link, oleh karenanya mengirimkan solicitation ke all-router-on-link multicast address “ff02::2”.

Penemuan (discovery) Neighbor

Neighbor discovery solicitation untuk deteksi address ganda / duplikat

Paket berikut dikirim oleh sebuah node dengan layer 2 MAC address “0:12:34:12:34:56” saat autokonfigurasi untuk mencek apakah ada address yang sudah digunakan oleh node lain di jaringan. Hal ini dilakukan dengan mengirim ke solicited-node link-local multicast address.

Node ingin mengkonfigurasi link-local address “fe80::212:34ff:fe12:3456”, cek apakah ada yang menggunakan 

15:44:17.712338 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
¬ fe80::212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32, hlim 255)

Node ingin mengkonfigurasi global addressnya “2002:0102:0304:1:212:34ff:fe12:3456” (setelah menerima advertisement di atas), cek apakah ada duplikasi 

15:44:21.905596 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
¬ 2002:0102:0304:1:212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32,
¬ hlim 255)

Node ingin mengkonfigurasi global address “2001:0db8:0:1:212:34ff:fe12:3456” (setelah menerima advertisement di atas), cek apakah ada duplikasi 

15:44:22.304028 :: > ff02::1:ff12:3456: icmp6: neighbor sol: who has
¬ 2001:0db8:0:1:212:34ff:fe12:3456(src lladdr: 0:12:34:12:34:56) (len 32, hlim
¬ 255)

Neighbor discovery solicitation untuk mencari for host atau gateway

Node ingin mengirim paket ke “2001:0db8:0:1::10” tapi tidak punya layer 2 MAC address untuk mengirimkan paket, oleh karenanya mengirimkan solicitation 

13:07:47.664538 2002:0102:0304:1:2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6:
¬ neighbor sol: who has 2001:0db8:0:1::10(src lladdr: 0:e0:18:90:92:5) (len 32,
¬ hlim 255)

Node mencari “fe80::10” 

13:11:20.870070 fe80::2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6: neighbor
¬ sol: who has fe80::10(src lladdr: 0:e0:18:90:92:5) (len 32, hlim 255)
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