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

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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==
===Router advertisement===
 
===14.2.1.1. Router advertisement===


  15:43:49.484751 fe80::212:34ff:fe12:3450 > ff02::1: icmp6: router
  15:43:49.484751 fe80::212:34ff:fe12:3450 > ff02::1: icmp6: router
Line 16: Line 14:
  ¬ 0:12:34:12:34:50) (len 88, hlim 255)
  ¬ 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”.
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”.


===14.2.1.2. Router solicitation===
===Router solicitation===


  15:44:21.152646 fe80::212:34ff:fe12:3456 > ff02::2: icmp6: 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)
  ¬ (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”.
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”.


==14.2.2. Neighbor discovery==
==Penemuan (discovery) Neighbor==


===14.2.2.1. Neighbor discovery solicitation for duplicate address detection===
===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.
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.
Line 48: Line 46:
  ¬ 255)
  ¬ 255)


===14.2.2.2. Neighbor discovery solicitation for looking for host or gateway===
===Neighbor discovery solicitation for looking for host or gateway===


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
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

Revision as of 02:37, 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 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. 

   Node wants to configure its link-local address “fe80::212:34ff:fe12:3456”, checks for duplicate now

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 wants to configure its global address “2002:0102:0304:1:212:34ff:fe12:3456” (after receiving advertisement shown above), checks for duplicate 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)

   Node wants to configure its global address “2001:0db8:0:1:212:34ff:fe12:3456” (after receiving advertisement shown above), checks for duplicate 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)

Neighbor discovery solicitation for looking for host or gateway

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 

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 looks for “fe80::10” now 

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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