-
Configuration d'une interface Ethernet sous Linux :
douaisis# /sbin/ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:10:B5:86:B6:A7
inet addr:193.48.57.36 Bcast:193.48.57.63 Mask:255.255.255.224
inet6 addr: 2001:660:4401:6002:210:b5ff:fe86:b6a7/64 Scope:Global
inet6 addr: fe80::210:b5ff:fe86:b6a7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:65304644 errors:0 dropped:0 overruns:0 frame:0
TX packets:66466136 errors:0 dropped:0 overruns:1 carrier:0
collisions:0 txqueuelen:100
RX bytes:3113046169 (2.8 GiB) TX bytes:2088704981 (1.9 GiB)
Interrupt:11
- Type de messages DHCP (T53) :
1 DHCPDISCOVER
2 DHCPOFFER
3 DHCPREQUEST
4 DHCPDECLINE
5 DHCPACK
6 DHCPNAK
7 DHCPRELEASE
- Analyse d'une session DHCP :
pevele# tcpdump -vvv -s 1024 -e port bootps or port bootpc
gayant05# ifdown eth0 ; sleep 5 ; ifup eth0
pevele# tcpdump ...
15:29:27.437993 0:d0:bc:bf:6c:38 0:60:8:71:b9:82 ip 342:
router-students.priv.eudil.fr.bootps > pevele.eudil.fr.bootps:
(request) hops:1 xid:0x8382b23e G:router-students.priv.eudil.fr
ether 0:10:b5:7:34:a3 vend-rfc1048 T53:1
(ttl 255, id 9180)
15:29:28.438911 0:60:8:71:b9:82 0:d0:bc:bf:6c:38 ip 359:
pevele.eudil.fr.bootps > router-students.priv.eudil.fr.bootps:
(reply) hops:1 xid:0x8382b23e Y:gayant05.priv.eudil.fr
S:pevele.eudil.fr G:router-students.priv.eudil.fr
ether 0:10:b5:7:34:a3 file "gayant05 vend-rfc1048 T53:2
T54:3241163042 T51:93600 T58:46800 T59:81900 SM:255.255.240.0
DG:router-students.priv.eudil.fr NS:pevele.eudil.fr
HN:"gayant05" DN:"priv.eudil.fr" T28:2887393279
(ttl 64, id 28934)
15:29:28.456249 0:d0:bc:bf:6c:38 0:60:8:71:b9:82 ip 590:
router-students.priv.eudil.fr.bootps > pevele.eudil.fr.bootps:
(request) hops:1 xid:0x8382b23e G:router-students.priv.eudil.fr
ether 0:10:b5:7:34:a3 vend-rfc1048 T57:548
T55:1.3.6.15.28.12.7.9.42.48.49 HN:"gayant05" T51:43200 T53:3
T54:3241163042 T50:2887389578
(ttl 255, id 9184)
15:29:28.494105 0:60:8:71:b9:82 0:d0:bc:bf:6c:38 ip 347:
pevele.eudil.fr.bootps > router-students.priv.eudil.fr.bootps:
(reply) hops:1 xid:0x8382b23e Y:gayant05.priv.eudil.fr
S:pevele.eudil.fr G:router-students.priv.eudil.fr
ether 0:10:b5:7:34:a3 file "gayant05 vend-rfc1048 T53:5
T54:3241163042 T51:43200 SM:255.255.240.0
DG:router-students.priv.eudil.fr NS:pevele.eudil.fr
DN:"priv.eudil.fr" T28:2887393279 HN:"gayant05"
(ttl 64, id 28946)
- Avertissement de routeur en IPv6 :
douaisis# tcpdump -vvv -s 1024 -e icmp6
13:17:04.112383 0:d0:58:f3:4b:10 33:33:0:0:0:1 ip6 118:
fe80::2d0:58ff:fef3:4b10 > ip6-allnodes:
icmp6: router advertisement
(chlim=64, pref=medium, router_ltime=1800,
reachable_time=0, retrans_time=0)
(src lladdr: 00:d0:58:f3:4b:10)
(mtu: mtu=1500)
(prefix info: LA valid_ltime=2592000,preferred_ltime=604800,
prefix=net-servers.escaut.net/64)
[class 0xe0] (len 64, hlim 255)
douaisis# host -t any net-servers.escaut.net
net-servers.escaut.net MX 100 douaisis.escaut.net
net-servers.escaut.net A 193.48.57.32
net-servers.escaut.net AAAA 2001:660:4401:6002:0:0:0:0
- Sollicitation de routeur en IPv6 :
douaisis# tcpdump -vvv -s 1024 -e icmp6
artois# ifdown vlan2 ; ifup vlan2
douaisis# tcpdump ...
13:19:55.334322 0:b:db:5c:98:2c 33:33:ff:5c:98:2c ip6 78:
:: > ff02::1:ff5c:982c:
icmp6: neighbor sol:
who has fe80::20b:dbff:fe5c:982c (len 24, hlim 255)
13:19:56.334373 0:b:db:5c:98:2c 33:33:0:0:0:2 ip6 70:
fe80::20b:dbff:fe5c:982c > ip6-allrouters:
icmp6: router solicitation
(src lladdr: 00:0b:db:5c:98:2c) (len 16, hlim 255)
13:19:56.335277 0:d0:58:f3:4b:10 33:33:0:0:0:1 ip6 118:
fe80::2d0:58ff:fef3:4b10 > ip6-allnodes:
icmp6: router advertisement
(chlim=64, pref=medium, router_ltime=1800, reachable_time=0,
retrans_time=0)
(src lladdr: 00:d0:58:f3:4b:10)
(mtu: mtu=1500)
(prefix info: LA valid_ltime=2592000,preferred_ltime=604800,
prefix=net-servers.escaut.net/64)
[class 0xe0] (len 64, hlim 255)
douaisis# grep ip6-allrouters /etc/hosts
ff02::2 ip6-allrouters
- Sollicitation de routeur en IPv6 :
artois# route -A inet6 | grep vlan2
Destination Next Hop Flags Metric Ref Use Iface
2001:660:4401:6002::/64 :: UA 256 2 0 vlan2
fe80::/64 :: UA 256 0 0 vlan2
ff00::/8 :: UA 256 0 0 vlan2
::/0 fe80::2d0:58ff:fef3:4b10 UGDA 1024 9 1 vlan2
