Red Hat Bugzilla – Bug 497384
[enh] NM kills connections and VPN
Last modified: 2010-12-05 01:55:53 EST
I'm in a location with a crappy AP that seems to keep rebooting.
This means a momentary wireless outage, followed by reassociation to the network (which the driver probably ought to handle automatically).
NetworkManager seems to take the network down entirely and re-do DHCP when this happens. And terminates my VPN connection (which means I get a _different_ internal IP address from the crappy Cisco VPN server after I _manually_ reconnect and reauthenticate). It also causes all my NFS mounts to get unmounted, and triggers Evolution's bug where it never redraws a folder index after being signalled about offline/online state.
If I was still using the old static network configuration, this would be fine -- we're just reconnect to the wireless network after the AP reboots, and all would be well.
Perhaps NetworkManager should only re-do DHCP and signal a disconnection if it fails to reconnect to the same AP within 30 seconds or so?
Reporter, thanks for filling this bug.
It looks like more than a enhancement request. Therefore I changed the title to reflect the enhancement request.
Fedora Bugzappers volunteer triage team
The latency problem here sucks. There's no difference client-side between going out of range of the AP, the AP being turned off, or the AP being shitty. NetworkManager has a 15 or 20 second reassociation timer; if the connection drops, and it doesn't reassociate in 15 seconds, the connection is dropped as well. Suggestions are:
1) there's some supplicant stupidity WRT connections and scanning
2) use disable_hw_scan=1 on your iwlwifi hardware because Intel hardware scanning simply blows chunks
3) don't use shitty APs
Your old static configuration also wouldn't know when you walked out of range of the AP or resumed in a different location.
In short, I think this is not as much an NM issue as a stack issue with the supplicant and mac80211. Grabbing some debug logging from wpa_supplicant by adding "-dddt" to the end of the Exec= line in /usr/share/dbus-1/system-services/fi.epitest.hostap.WPASupplicant.service and then 'killall -TERM wpa_supplicant', suffering through a disconnection or two, and then sending off /var/log/wpa_supplicant.log and /var/log/messages would be very helpful.
Will be back in this office some time next week and will debug further then.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
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