Network errors on eth0:
If the ethernet adaptor according to lspci is "Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)" then set the MTU=1000 (in contrast to default of 1500) as per a previous posting.
BCM4312 wifi driver:
If you are unlucky still to have Broadcom wireless hardware in your G550, then some work lies ahead. This specific hardware identifies itself to lspci as
Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
Mandriva gives you the option to use the new dkms-broadcom-wl package, but it simply did not want to install on the default 2.6.39 kernel due to DKMS build failures. I decided to settle for using the firmware-dependent b43 driver instead. For this the b43-fwcutter package had to be installed and the firmware downloaded from openwrt and unpacked.
Edit /etc/modprobe.conf and add the line
options b43 pio=1 qos=0(Src: OpenSuse Forums)
As root, run the following commands
b43-fwcutter -w /lib/firmware /path/to/unpacked-broadcom-wl/linux/wl_apsta.o
modprobe -r b43
Finally setting MTU=1000 as was the case for the ethernet hardware, solved the dropping of packets.
If you are running KDE, uninstall kmail (there are better email clients), virtuoso & nepomuk.