Thread: Frequent network interruptions (no wicd or network manager)

hello all, ubuntu (10.04) laptop behaving quite annoyingly on network:

connected are: windows pc (wired) , laptop (either wired or wireless wpa).

management of network interfaces: pure ifup/ifdown based on /etc/network/interfaces. (nothing wicd/nm on laptop)

symptoms: 2 different situations may (one of them will, it's matter of time) happen:
a) windows pc getting fine connection (browsing , everything: ok), when enabling connected interface on laptop (wlan0 or eth2) can load few pages in firefox or connect skype or small, after (quite fast...), both windows pc , ubuntu laptop lose connection.
b) not happen right away , happens on laptop, lose connection (windows pc fine)
both) "losing connection" mean "nothing can loaded in ff or whatever else, did not notice changes in 'ifconfig' results , i'm still able ping outside world".

current "remedies": depends on situation:
a) swear internally, reset modem... wait , start browsing again.
b) issuing "sudo /etc/init.d/networking restart" sufficient give me working connection...

voila, if need else i'll more happy provide information need.

in advance...

a few things might help:

/etc/network/interfaces

code:

auto lo    iface lo inet loopback  iface wlan0 inet dhcp  iface eth2 inet dhcp    iface default inet dhcp    iface bonheiden inet dhcp  	wpa-ssid belkin54g  	wpa-psk xxxxxx

/etc/resolv.conf

code:

nameserver 192.168.2.1  domain belkin  search belkin

sudo lshw -c network

code:

  *-network disabled               description: ethernet interface         product: ar8152 v1.1 fast ethernet         vendor: atheros communications         physical id: 0         bus info: pci@0000:02:00.0         logical name: eth2         version: c1         serial: 00:26:6c:88:24:a6         capacity: 100mb/s         width: 64 bits         clock: 33mhz         capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation         configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.0.2-napi firmware=n/a latency=0 link=yes multicast=yes port=twisted pair         resources: irq:16 memory:d5000000-d503ffff ioport:3000(size=128)    *-network         description: wireless interface         product: realtek semiconductor co., ltd.         vendor: realtek semiconductor co., ltd.         physical id: 0         bus info: pci@0000:03:00.0         logical name: wlan0         version: 10         serial: 4c:ed:de:11:d1:0e         width: 32 bits         clock: 33mhz         capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless         configuration: broadcast=yes driver=rtl819xse driverversion=0015.0127.2010 firmware=62 ip=192.168.2.4 latency=0 link=yes multicast=yes wireless=802.11bg         resources: irq:17 ioport:2000(size=256) memory:d4000000-d4003fff    *-network disabled         description: ethernet interface         physical id: 2         logical name: vboxnet0         serial: 0a:00:27:00:00:00         capabilities: ethernet physical         configuration: broadcast=yes multicast=yes

thanks time...

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