Re: Invalid IP-assignment if assigned within pushed route

["Jonathan Petersson" <jpetersson garnser se>]

Please see first part och the log-file:, OpenVPN pushes it:

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.

On Fri, Jan 9, 2009 at 8:39 AM, Dan Williams <dcbw redhat com> wrote:
> 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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