Difference between revisions of "IPv6 Debugging: Contoh untuk tcpdump paket dump"
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...more coming next... | ...more coming next... | ||
| − | 14.2.1. Router discovery | + | ==14.2.1. Router discovery== |
| − | 14.2.1.1. 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 | ||
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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 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”. | ||
| − | 14.2.1.2. Router solicitation | + | ===14.2.1.2. 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 | ||
| Line 25: | Line 25: | ||
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 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”. | ||
| − | 14.2.2. Neighbor discovery | + | ==14.2.2. Neighbor discovery== |
| − | 14.2.2.1. Neighbor discovery solicitation for duplicate address detection | + | |
| + | ===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. | 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 47: | Line 48: | ||
¬ 255) | ¬ 255) | ||
| − | 14.2.2.2. Neighbor discovery solicitation for looking for host or gateway | + | ===14.2.2.2. 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: | 13:07:47.664538 2002:0102:0304:1:2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6: | ||
| Line 55: | Line 56: | ||
¬ hlim 255) | ¬ hlim 255) | ||
| − | + | Node looks for “fe80::10” now | |
13:11:20.870070 fe80::2e0:18ff:fe90:9205 > ff02::1:ff00:10: icmp6: neighbor | 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) | ¬ sol: who has fe80::10(src lladdr: 0:e0:18:90:92:5) (len 32, hlim 255) | ||
Revision as of 14:34, 3 July 2013
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
14.2.1.1. 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 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”.
14.2.1.2. 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 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”.
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.
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)
14.2.2.2. 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)