eth0 link goes up then down then up
 

i keep getting this:
this from /var/log/messages:
Aug 21 16:11:40 darkstar kernel: eth0: link down
Aug 21 16:11:41 darkstar kernel: eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

this is from /var/log/debug:
Aug 21 16:01:09 darkstar dhcpcd[2767]: broadcasting DHCP_DISCOVER
Aug 21 16:01:10 darkstar dhcpcd[2767]: broadcastAddr option is missing in DHCP server response. Assuming 192.168.1.255
Aug 21 16:01:10 darkstar dhcpcd[2767]: dhcpIPaddrLeaseTime=86400 in DHCP server response.
Aug 21 16:01:10 darkstar dhcpcd[2767]: dhcpT1value is missing in DHCP server response. Assuming 43200 sec
Aug 21 16:01:10 darkstar dhcpcd[2767]: dhcpT2value is missing in DHCP server response. Assuming 75600 sec
Aug 21 16:01:10 darkstar dhcpcd[2767]: DHCP_OFFER received from (192.168.1.1)
Aug 21 16:01:10 darkstar dhcpcd[2767]: broadcasting DHCP_REQUEST for 192.168.1.100
Aug 21 16:01:10 darkstar dhcpcd[2767]: dhcpIPaddrLeaseTime=86400 in DHCP server response.
Aug 21 16:01:10 darkstar dhcpcd[2767]: dhcpT1value is missing in DHCP server response. Assuming 43200 sec
Aug 21 16:01:10 darkstar dhcpcd[2767]: dhcpT2value is missing in DHCP server response. Assuming 75600 sec
Aug 21 16:01:10 darkstar dhcpcd[2767]: DHCP_ACK received from (192.168.1.1)

over and over in my log. its been fine for months this just started last night dunno whats wrong i didnt change any settings or anything any help would be much appriciated

Internet provider problem?
router problem?

Check the following things:

• Ethernet cable is not flaky/crushed behind a furniture or rat/mice infested
• Your router/switch/hub is rebooting - check the power lines and actual behavior - particularly for routers
• Your ISP is doing something so they are rebooting your cable modem remotely - repeatedly at that

well i got it fixed i ended up doing : ifconfig eth0 down, then i killed dhcpcd then i restarted dhcpcd then i did ifconfig eth0 up and everything has been fine since