Bon en cherchant un peu voila ce qu'il y a dans le /var/log/messages (l'adresse IP affectee par le dhcp a ete renommee aaa.bbb.ccc.ddd).
Comme on peut le voir, à 13:59:21, le FAI change l'IP mais à 13:59:27 le script dhcpcd.exe (qui est en fait rc.updatered) met la carte RED down.
Les logs de 22:50 sont la pour comparaison lorsque j'ai redemarrer la connexion manuellement (d'abord connexion mais ca marche pas puis deconnexion et reconnexion).
De memoire, DHCP_NAK est un "negative acknowledegement" envoye par le serveur dhcp pour forcer le client à refaire une decouverte DHCP. D'ailleurs, ca fonctionne bien sauf qu'a la fin, on se retrouve avec eth1 down
Aug 10 13:59:21 ipcop-host dhcpcd[251]: DHCP_NAK server response received
Aug 10 13:59:21 ipcop-host dhcpcd[251]: DHCP_NAK server response received
Aug 10 13:59:21 ipcop-host kernel: eth1: link up, 10Mbps, full-duplex, lpa 0x4061
Aug 10 13:59:27 ipcop-host dnsmasq[16006]: started, version 1.18 cachesize 150
Aug 10 13:59:27 ipcop-host dnsmasq[16006]: read /etc/hosts - 3 addresses
Aug 10 13:59:27 ipcop-host dnsmasq[16006]: reading /var/ipcop/red/resolv.conf
Aug 10 13:59:27 ipcop-host dnsmasq[16006]: using nameserver 212.27.39.1#53
Aug 10 13:59:27 ipcop-host dnsmasq[16006]: using nameserver 213.228.0.23#53
Aug 10 13:59:27 ipcop-host dnsmasq[16006]: reading /var/state/dhcp/dhcpd.leases
Aug 10 13:59:27 ipcop-host dnsmasq[16015]: started, version 1.18 cachesize 150
Aug 10 13:59:27 ipcop-host dnsmasq[16015]: read /etc/hosts - 3 addresses
Aug 10 13:59:27 ipcop-host dnsmasq[16015]: reading /var/ipcop/red/resolv.conf
Aug 10 13:59:27 ipcop-host dnsmasq[16015]: using nameserver 212.27.39.1#53
Aug 10 13:59:27 ipcop-host dnsmasq[16015]: using nameserver 213.228.0.23#53
Aug 10 13:59:27 ipcop-host dnsmasq[16015]: reading /var/state/dhcp/dhcpd.leases
Aug 10 13:59:27 ipcop-host dhcpcd.exe: eth1 has been configured with new IP=AAA.BBB.CCC.DDD
Aug 10 13:59:27 ipcop-host dhcpcd.exe: eth1 has been brought down
[...]
Aug 10 22:50:35 ipcop-host ipcop: Starting RED device eth1.
Aug 10 22:50:35 ipcop-host ipcop: dhcpcd fail
Aug 10 22:50:35 ipcop-host ipcop: Dial failed: 256
Aug 10 22:51:58 ipcop-host dhcpcd[251]: terminating on signal 15
Aug 10 22:52:02 ipcop-host dnsmasq[18556]: started, version 1.18 cachesize 150
Aug 10 22:52:02 ipcop-host dnsmasq[18556]: read /etc/hosts - 3 addresses
Aug 10 22:52:02 ipcop-host dnsmasq[18556]: reading /var/ipcop/red/resolv.conf
Aug 10 22:52:02 ipcop-host dnsmasq[18556]: using nameserver 212.27.39.1#53
Aug 10 22:52:02 ipcop-host dnsmasq[18556]: using nameserver 213.228.0.23#53
Aug 10 22:52:02 ipcop-host dnsmasq[18556]: reading /var/state/dhcp/dhcpd.leases
Aug 10 22:52:02 ipcop-host dhcpcd.exe: eth1 has been brought down
Aug 10 22:52:08 ipcop-host ipcop: Starting RED device eth1.
Aug 10 22:52:08 ipcop-host kernel: eth1: link up, 10Mbps, full-duplex, lpa 0x4061
Aug 10 22:52:08 ipcop-host ipcop: dhcpcd success
Aug 10 22:52:12 ipcop-host dnsmasq[18636]: started, version 1.18 cachesize 150
Aug 10 22:52:12 ipcop-host dnsmasq[18636]: read /etc/hosts - 3 addresses
Aug 10 22:52:12 ipcop-host dnsmasq[18636]: reading /var/ipcop/red/resolv.conf
Aug 10 22:52:12 ipcop-host dnsmasq[18636]: using nameserver 212.27.39.1#53
Aug 10 22:52:12 ipcop-host dnsmasq[18636]: using nameserver 213.228.0.23#53
Aug 10 22:52:12 ipcop-host dnsmasq[18636]: reading /var/state/dhcp/dhcpd.leases
Aug 10 22:52:12 ipcop-host dhcpcd.exe: eth1 has been configured with old IP=AAA.BBB.CCC.DDD