Re: Invalid IP-assignment if assigned within pushed route

[Dan Williams <dcbw redhat com>]

On Thu, 2009-01-08 at 23:08 -0800, Jonathan Petersson wrote:
> Hi all,
> 
> I've encountered something that seams like a bug.
> 
> The OpenVPN server I connect to assigns me a 10.100.40.X/24 IP. The
> server is also pushing the range 10.100.0.0/16. As my client becomes
> aware of it, it changes the assigned netmask resulting in 10.0.40.X/16
> which causes various fun issues.

AFAIK, OpenVPN doesn't pass the netmask that the IP address it returns
is supposed to use to the ip-up script.  How is your client supposed to
know that the prefix is /24?  Do you have to hardcode that, or is the
netmask now passed through to the script?

Dan

> Please see the following log info:
> 
> Jan  8 22:59:39 jpetersson-desk1 nm-openvpn[14982]: TUN/TAP device tap0 opened
> Jan  8 22:59:39 jpetersson-desk1 nm-openvpn[14982]: /sbin/ifconfig
> tap0 10.100.40.5 netmask 255.255.255.0 mtu 1500 broadcast
> 10.100.40.255
> Jan  8 22:59:39 jpetersson-desk1 vmnetBridge: RTM_NEWLINK: name:tap0
> index:14 flags:0x00011043
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Joining mDNS
> multicast group on interface tap0.IPv4 with address 10.100.40.5.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: New relevant
> interface tap0.IPv4 for mDNS.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Registering new
> address record for 10.100.40.5 on tap0.IPv4.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Withdrawing
> address record for 10.100.40.5 on tap0.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Leaving mDNS
> multicast group on interface tap0.IPv4 with address 10.100.40.5.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Interface
> tap0.IPv4 no longer relevant for mDNS.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Joining mDNS
> multicast group on interface tap0.IPv4 with address 10.100.40.5.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: New relevant
> interface tap0.IPv4 for mDNS.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Registering new
> address record for 10.100.40.5 on tap0.IPv4.
> Jan  8 22:59:39 jpetersson-desk1 nm-openvpn[14982]:
> /usr/lib/network-manager-openvpn/nm-openvpn-service-openvpn-helper
> tap0 1500 1573 10.100.40.5 255.255.255.0 init
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  VPN
> connection 'XXX--VPN-udp' (IP Config Get) reply received.
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  VPN Gateway:
> 123.123.123.123
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Internal
> Gateway: 10.100.40.1
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Tunnel Device: tap0
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Internal IP4
> Address: 10.100.40.5
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Internal IP4 Prefix: 16
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Internal IP4
> Point-to-Point Address: 0.0.0.0
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Maximum
> Segment Size (MSS): 0
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Static Route:
> 10.100.0.0/16   Next Hop: 10.100.0.0
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Internal IP4
> DNS: 10.100.X.Y
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  DNS Domain: 'asd.asd'
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  Login Banner:
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>
> -----------------------------------------
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>  (null)
> Jan  8 22:59:39 jpetersson-desk1 NetworkManager: <info>
> -----------------------------------------
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Withdrawing
> address record for 10.100.40.5 on tap0.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Leaving mDNS
> multicast group on interface tap0.IPv4 with address 10.100.40.5.
> Jan  8 22:59:39 jpetersson-desk1 nm-openvpn[14982]: Initialization
> Sequence Completed
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Interface
> tap0.IPv4 no longer relevant for mDNS.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Joining mDNS
> multicast group on interface tap0.IPv4 with address 10.100.40.5.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: New relevant
> interface tap0.IPv4 for mDNS.
> Jan  8 22:59:39 jpetersson-desk1 avahi-daemon[6615]: Registering new
> address record for 10.100.40.5 on tap0.IPv4.
> Jan  8 22:59:40 jpetersson-desk1 NetworkManager: <info>  (tap0):
> writing resolv.conf to /sbin/resolvconf
> Jan  8 22:59:40 jpetersson-desk1 NetworkManager: <info>  VPN
> connection 'XXX--VPN-udp' (IP Config Get) complete.
> Jan  8 22:59:40 jpetersson-desk1 NetworkManager: <info>  (eth0):
> writing resolv.conf to /sbin/resolvconf
> Jan  8 22:59:40 jpetersson-desk1 NetworkManager: <info>  Policy set
> 'Auto eth0' (eth0) as default for routing and DNS.
> Jan  8 22:59:40 jpetersson-desk1 NetworkManager: <info>  VPN plugin
> state changed: 4
> Jan  8 22:59:40 jpetersson-desk1 nm-dispatcher.action: Script
> '/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status
> 1.
> Jan  8 22:59:41 jpetersson-desk1 avahi-daemon[6615]: Registering new
> address record for fe80::f822:d7ff:febb:19b2 on tap0.*.
> Jan  8 22:59:50 jpetersson-desk1 kernel: [ 7078.372254] tap0: no IPv6
> routers present
> 
> /Jonathan
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