[SOLVED) No network with either wired or wireless

My network on my Arch laptop seems to be not working. It was intermittent yesterday and now doesn't work at all. The router works both wirelessly and plugged in - tested with another (windows 7) computer. The intermittent problem was present on two different ISPs as well, so I am pretty sure it is not a service issue at the ISP end.
The networkmanager applet indicates that the router is connected. I tried a few things from this forum to no avail, and always reverted any changes so it seems that I did not do anything out of the ordinary. I tried to do a -Syu update but it failed mid-way due not being able to access the mirrors.
How can I check whether this is hardware or software settings problem?
Last edited by raavas (2012-05-21 17:55:24)

Ok, we're back in business. The USB works again.
Here is the report of ip addr:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether 88:ae:1d:9a:11:cf brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 70:f1:a1:d8:b6:2a brd ff:ff:ff:ff:ff:ff
inet 192.168.1.2/24 brd 192.168.1.255 scope global wlan0
inet6 fe80::72f1:a1ff:fed8:b62a/64 scope link
valid_lft forever preferred_lft forever
and here is lspci -nn
00:00.0 Host bridge [0600]: Advanced Micro Devices [AMD] RS880 Host Bridge [1022:9601]
00:02.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (ext gfx port 0) [1022:9603]
00:04.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 0) [1022:9604]
00:05.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 1) [1022:9605]
00:11.0 SATA controller [0106]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] [1002:4391]
00:12.0 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397]
00:12.2 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396]
00:13.0 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397]
00:13.2 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396]
00:14.0 SMBus [0c05]: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller [1002:4385] (rev 41)
00:14.1 IDE interface [0101]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 IDE Controller [1002:439c] (rev 40)
00:14.2 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) [1002:4383] (rev 40)
00:14.3 ISA bridge [0601]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller [1002:439d] (rev 40)
00:14.4 PCI bridge [0604]: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge [1002:4384] (rev 40)
00:14.5 USB controller [0c03]: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI2 Controller [1002:4399]
00:18.0 Host bridge [0600]: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration [1022:1200]
00:18.1 Host bridge [0600]: Advanced Micro Devices [AMD] Family 10h Processor Address Map [1022:1201]
00:18.2 Host bridge [0600]: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller [1022:1202]
00:18.3 Host bridge [0600]: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control [1022:1203]
00:18.4 Host bridge [0600]: Advanced Micro Devices [AMD] Family 10h Processor Link Control [1022:1204]
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Madison [Radeon HD 5000M Series] [1002:68c1]
01:00.1 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI Redwood HDMI Audio [Radeon HD 5000 Series] [1002:aa60]
02:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe [14e4:1692] (rev 01)
08:00.0 Network controller [0280]: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) [168c:002a] (rev 01)
How can I proceed?

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    Hi mishink7,
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    Because you are having networking problems with both wired and wireless, it seems likely that the problems are caused not by the network device drivers, but by something higher in the network "stack". Did you install or update a firewall, Access Connections, or any other software just before you started having network problems?
    Best regards,
    Frank
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