Multumesc de raspunsuri in primul rand.
placa de retea: intel 82572EI Gigabyte Ethernet controller (copper)
nu e legata in switch e conexiune direct din media convertor (e o
linie de fibra)

ip-ul este static dat de la provider (ar trebui sa fie unic :)
mac-ul...cum pot sa verific unicitatea lui ?

comanda service network restart da :
shutting down eth1 ... ok
shutting down loopback intf ok
bringing up loopback intf. ok
bringing up eth1 ok

iar in log da asta:
Feb  1 16:09:01 89 NetworkManager: <info>  (eth1): carrier now OFF
(device state 8)
Feb  1 16:09:01 89 NetworkManager: <info>  (eth1): device state change: 8 -> 2
Feb  1 16:09:01 89 NetworkManager: <info>  (eth1): deactivating device
(reason: 40).
Feb  1 16:09:02 89 kernel: ADDRCONF(NETDEV_UP): eth1: link is not ready
Feb  1 16:09:03 89 kernel: e1000e: eth1 NIC Link is Up 100 Mbps Full
Duplex, Flow Control: RX/TX
Feb  1 16:09:03 89 kernel: eth1: 10/100 speed: disabling TSO
Feb  1 16:09:03 89 kernel: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
Feb  1 16:09:03 89 dnsmasq[3061]: no servers found in
/etc/resolv.conf, will retry
Feb  1 16:09:03 89 NetworkManager: <info>  (eth1): carrier now ON
(device state 2)
Feb  1 16:09:03 89 NetworkManager: <info>  (eth1): device state change: 2 -> 3
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) starting
connection 'System eth1'
Feb  1 16:09:03 89 NetworkManager: <info>  (eth1): device state change: 3 -> 4
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 1
of 5 (Device Prepare) scheduled...
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 1
of 5 (Device Prepare) started...
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 2
of 5 (Device Configure) scheduled...
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 1
of 5 (Device Prepare) complete.
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 2
of 5 (Device Configure) starting...
Feb  1 16:09:03 89 NetworkManager: <info>  (eth1): device state change: 4 -> 5
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 2
of 5 (Device Configure) successful.
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 3
of 5 (IP Configure Start) scheduled.
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 2
of 5 (Device Configure) complete.
Feb  1 16:09:03 89 NetworkManager: <info>  Activation (eth1) Stage 3
of 5 (IP Configure Start) started...
Feb  1 16:09:04 89 NetworkManager: <info>  (eth1): device state change: 5 -> 7
Feb  1 16:09:04 89 NetworkManager: <info>  Activation (eth1) Stage 4
of 5 (IP Configure Get) scheduled...
Feb  1 16:09:04 89 NetworkManager: <info>  Activation (eth1) Stage 3
of 5 (IP Configure Start) complete.
Feb  1 16:09:04 89 NET[18786]:
/etc/sysconfig/network-scripts/ifup-post : updated /etc/resolv.conf
Feb  1 16:09:04 89 NetworkManager: <info>  Activation (eth1) Stage 4
of 5 (IP Configure Get) started...
Feb  1 16:09:04 89 NetworkManager: <info>  Activation (eth1) Stage 5
of 5 (IP Configure Commit) scheduled...
Feb  1 16:09:04 89 NetworkManager: <info>  Activation (eth1) Stage 4
of 5 (IP Configure Get) complete.
Feb  1 16:09:04 89 NetworkManager: <info>  Activation (eth1) Stage 5
of 5 (IP Configure Commit) started...
Feb  1 16:09:05 89 NetworkManager: <info>  (eth1): device state change: 7 -> 8
Feb  1 16:09:05 89 NetworkManager: <info>  Policy set 'System eth1'
(eth1) as default for routing and DNS.
Feb  1 16:09:05 89 NetworkManager: <info>  Activation (eth1)
successful, device activated.
Feb  1 16:09:05 89 NetworkManager: <info>  Activation (eth1) Stage 5
of 5 (IP Configure Commit) complete.
Feb  1 16:09:07 89 dnsmasq[3061]: reading /etc/resolv.conf
Feb  1 16:09:07 89 dnsmasq[3061]: using nameserver 89.34.72.42#53
Feb  1 16:09:07 89 dnsmasq[3061]: using nameserver 89.37.120.6#53



Problema asta a aparut acum doua luni si de atunci ma tot lupt cu ea.
nu reusesc sa identific cauza.
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