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If you would like help, here is a few things you will want to do in order to help us help you.

**Post your configs from client and server, without comments. you can strip comments in linux/bsd with something like this:
grep -vE '^#|^;|^$' server.conf
**Tell us your goal.
**If you are having problems connecting, post your logfiles from server and client after using verb 4 in both configs


Also, there are 2 things you should be aware of:

**Sometimes you cannot avoid tunneling over tcp, but if you can avoid it, DO. Why TCP Over TCP Is A Bad Idea: http://sites.inka.de/~bigred/devel/tcp-tcp.html
**You ONLY want to use dev tap if you are tunneling layer2 traffic, if you are using IP traffic you want tun. If you are using tap only for windows file sharing, look into running a WINS server instead.



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 DD-WRT client, Ubuntu 10.04 LTS as server 
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 Post subject: DD-WRT client, Ubuntu 10.04 LTS as server
PostPosted: Sun Jan 16, 2011 9:13 pm 
OpenVpn Newbie

Joined: Sun Jan 16, 2011 8:35 pm
Posts: 3
Running Firmware: DD-WRT v24-sp2 (10/10/09) vpn on a router as a Client.

I have a dedicated VPS on a remote server. I have installed OpenVPS on that server. It is running Ubuntu 10.04

I do not see any errors being reported in my logs, but when I check my IP address at a remote website it reports local my service provider IP instead of my remote VPN address.

In the startup command line area, I have added:
openvpn --mktun --dev tap0
brctl addif br0 tap0
ifconfig tap0 0.0.0.0 promisc up

In the firewall command line startup area , I have added:
iptables -A INPUT -i tap0 -j ACCEPT
iptables -I INPUT -p udp --dport 1194 -j ACCEPT

Client - Here is my DD-WRT log
Jan 16 15:46:43 DD-WRT daemon.notice openvpn[697]: OpenVPN 2.1_rc20 mipsel-unknown-linux-gnu [SSL] [LZO1] [EPOLL] built on Oct 10 2009
Jan 16 15:46:44 DD-WRT daemon.notice openvpn[729]: UDPv4 link local: [undef]
Jan 16 15:46:44 DD-WRT daemon.notice openvpn[729]: UDPv4 link remote: XXX.XXX.188.102:1194
Jan 16 15:46:45 DD-WRT daemon.notice openvpn[729]: [VPSnet] Peer Connection Initiated with XXX.XXX.188.102:1194
Jan 16 15:46:48 DD-WRT daemon.notice openvpn[729]: TUN/TAP device tun0 opened
Jan 16 15:46:48 DD-WRT daemon.notice openvpn[729]: /sbin/ifconfig tun0 10.8.0.6 pointopoint 10.8.0.5 mtu 1500
Jan 16 15:46:48 DD-WRT daemon.notice openvpn[729]: Initialization Sequence Completed

I have also included the output from:
netstat -rn
ifconfig -a
brctl show


root@DD-WRT:~# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.8.0.5 0.0.0.0 255.255.255.255 UH 0 0 0 tun0
10.8.0.1 10.8.0.5 255.255.255.255 UGH 0 0 0 tun0
205.200.254.11 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 205.200.254.11 0.0.0.0 UG 0 0 0 ppp0

root@DD-WRT:~# ifconfig -a
br0 Link encap:Ethernet HWaddr 00:23:69:7F:5D:A7
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:44535 errors:0 dropped:0 overruns:0 frame:0
TX packets:65820 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4423696 (4.2 MiB) TX bytes:88685660 (84.5 MiB)

br0:0 Link encap:Ethernet HWaddr 00:23:69:7F:5D:A7
inet addr:169.254.255.1 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

eth0 Link encap:Ethernet HWaddr 00:23:69:7F:5D:A7
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:66528 errors:0 dropped:0 overruns:0 frame:0
TX packets:42564 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:87835147 (83.7 MiB) TX bytes:5729999 (5.4 MiB)
Interrupt:4

eth1 Link encap:Ethernet HWaddr 00:23:69:7F:5D:A9
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:46607 errors:0 dropped:0 overruns:0 frame:8889
TX packets:75845 errors:38 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6366254 (6.0 MiB) TX bytes:92122699 (87.8 MiB)
Interrupt:2 Base address:0x5000

etherip0 Link encap:Ethernet HWaddr 7A:10:51:00:F4:25
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MULTICAST MTU:16436 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:300 (300.0 B) TX bytes:300 (300.0 B)

ppp0 Link encap:Point-to-Point Protocol
inet addr:142.161.236.17 P-t-P:205.200.254.11 Mask:255.255.255.255
UP POINTOPOINT RUNNING MULTICAST MTU:1492 Metric:1
RX packets:62259 errors:0 dropped:0 overruns:0 frame:0
TX packets:35448 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:84670507 (80.7 MiB) TX bytes:2873617 (2.7 MiB)

tap0 Link encap:Ethernet HWaddr 00:FF:3D:DC:BB:BA
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:6122 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

teql0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.8.0.6 P-t-P:10.8.0.5 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:115 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:1955 (1.9 KiB) TX bytes:0 (0.0 B)

vlan0 Link encap:Ethernet HWaddr 00:23:69:7F:5D:A7
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3733 errors:0 dropped:0 overruns:0 frame:0
TX packets:6590 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1192651 (1.1 MiB) TX bytes:1717962 (1.6 MiB)

vlan1 Link encap:Ethernet HWaddr 00:23:69:7F:5D:A8
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:62791 errors:0 dropped:0 overruns:0 frame:0
TX packets:35975 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:85444275 (81.4 MiB) TX bytes:3813225 (3.6 MiB)


root@DD-WRT:~# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0023697f5da7 no vlan0
eth1
tap0


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 Post subject: Re: DD-WRT client, Ubuntu 10.04 LTS as server
PostPosted: Mon Jan 17, 2011 5:35 am 
OpenVpn Newbie

Joined: Sun Jan 16, 2011 8:35 pm
Posts: 3
I am now thinking that maybe the problem is with the Server side of this configuration.

I believe it is connecting to the server and attempting to work. When this happens I am no longer able to access my router 192.168.1.1 or anything else for that matter.
Because I can not access things when this happens I am unable to diagnose.

If the server and the client are talking and connecting, what setting do I need to change so that I can still access my router and the internet?

Here is my server.conf file I am using:

# Which local IP address should OpenVPN
# listen on? (optional)
local 98.158.188.102

# Which TCP/UDP port should OpenVPN listen on?
# If you want to run multiple OpenVPN instances
# on the same machine, use a different port
# number for each one. You will need to
# open up this port on your firewall.
port 1194

# TCP or UDP server?
;proto tcp
proto udp

# "dev tun" will create a routed IP tunnel,
# "dev tap" will create an ethernet tunnel.
# Use "dev tap0" if you are ethernet bridging
# and have precreated a tap0 virtual interface
# and bridged it with your ethernet interface.
# If you want to control access policies
# over the VPN, you must create firewall
# rules for the the TUN/TAP interface.
# On non-Windows systems, you can give
# an explicit unit number, such as tun0.
# On Windows, use "dev-node" for this.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel if you
# have more than one. On XP SP2 or higher,
# you may need to selectively disable the
# Windows firewall for the TAP adapter.
# Non-Windows systems usually don't need this.
;dev-node MyTap

# SSL/TLS root certificate (ca), certificate
# (cert), and private key (key). Each client
# and the server must have their own cert and
# key file. The server and all clients will
# use the same ca file.
#
# See the "easy-rsa" directory for a series
# of scripts for generating RSA certificates
# and private keys. Remember to use
# a unique Common Name for the server
# and each of the client certificates.
#
# Any X509 key management system can be used.
# OpenVPN can also use a PKCS #12 formatted key file
# (see "pkcs12" directive in man page).
ca ca.crt
cert server.crt
key server.key # This file should be kept secret

# Diffie hellman parameters.
# Generate your own with:
# openssl dhparam -out dh1024.pem 1024
# Substitute 2048 for 1024 if you are using
# 2048 bit keys.
dh dh1024.pem

# Configure server mode and supply a VPN subnet
# for OpenVPN to draw client addresses from.
# The server will take 10.8.0.1 for itself,
# the rest will be made available to clients.
# Each client will be able to reach the server
# on 10.8.0.1. Comment this line out if you are
# ethernet bridging. See the man page for more info.
server 10.8.0.0 255.255.255.0

# Maintain a record of client <-> virtual IP address
# associations in this file. If OpenVPN goes down or
# is restarted, reconnecting clients can be assigned
# the same virtual IP address from the pool that was
# previously assigned.
ifconfig-pool-persist ipp.txt

# Configure server mode for ethernet bridging.
# You must first use your OS's bridging capability
# to bridge the TAP interface with the ethernet
# NIC interface. Then you must manually set the
# IP/netmask on the bridge interface, here we
# assume 10.8.0.4/255.255.255.0. Finally we
# must set aside an IP range in this subnet
# (start=10.8.0.50 end=10.8.0.100) to allocate
# to connecting clients. Leave this line commented
# out unless you are ethernet bridging.
;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100

# Push routes to the client to allow it
# to reach other private subnets behind
# the server. Remember that these
# private subnets will also need
# to know to route the OpenVPN client
# address pool (10.8.0.0/255.255.255.0)
# back to the OpenVPN server.
push "route 192.168.1.0 255.255.255.0"
;push "route 192.168.20.0 255.255.255.0"

# To assign specific IP addresses to specific
# clients or if a connecting client has a private
# subnet behind it that should also have VPN access,
# use the subdirectory "ccd" for client-specific
# configuration files (see man page for more info).

# EXAMPLE: Suppose the client
# having the certificate common name "Thelonious"
# also has a small subnet behind his connecting
# machine, such as 192.168.40.128/255.255.255.248.
# First, uncomment out these lines:
;client-config-dir ccd
;route 192.168.40.128 255.255.255.248
# Then create a file ccd/Thelonious with this line:
# iroute 192.168.40.128 255.255.255.248
# This will allow Thelonious' private subnet to
# access the VPN. This example will only work
# if you are routing, not bridging, i.e. you are
# using "dev tun" and "server" directives.

# EXAMPLE: Suppose you want to give
# Thelonious a fixed VPN IP address of 10.9.0.1.
# First uncomment out these lines:
;client-config-dir ccd
;route 10.9.0.0 255.255.255.252
# Then add this line to ccd/Thelonious:
# ifconfig-push 10.9.0.1 10.9.0.2

# Suppose that you want to enable different
# firewall access policies for different groups
# of clients. There are two methods:
# (1) Run multiple OpenVPN daemons, one for each
# group, and firewall the TUN/TAP interface
# for each group/daemon appropriately.
# (2) (Advanced) Create a script to dynamically
# modify the firewall in response to access
# from different clients. See man
# page for more info on learn-address script.
;learn-address ./script
# If enabled, this directive will configure
# all clients to redirect their default
# network gateway through the VPN, causing
# all IP traffic such as web browsing and
# and DNS lookups to go through the VPN
# (The OpenVPN server machine may need to NAT
# the TUN/TAP interface to the internet in
# order for this to work properly).
# CAVEAT: May break client's network config if
# client's local DHCP server packets get routed
# through the tunnel. Solution: make sure
# client's local DHCP server is reachable via
# a more specific route than the default route
# of 0.0.0.0/0.0.0.0.
;push "redirect-gateway"

# Certain Windows-specific network settings
# can be pushed to clients, such as DNS
# or WINS server addresses. CAVEAT:
# http://openvpn.net/faq.html#dhcpcaveats
push "dhcp-option DNS 10.8.0.1"
push "dhcp-option WINS 10.8.0.1"
# Uncomment this directive to allow different
# clients to be able to "see" each other.
# By default, clients will only see the server.
# To force clients to only see the server, you
# will also need to appropriately firewall the
# server's TUN/TAP interface.
;client-to-client

# Uncomment this directive if multiple clients
# might connect with the same certificate/key
# files or common names. This is recommended
# only for testing purposes. For production use,
# each client should have its own certificate/key
# pair.
#
# IF YOU HAVE NOT GENERATED INDIVIDUAL
# CERTIFICATE/KEY PAIRS FOR EACH CLIENT,
# EACH HAVING ITS OWN UNIQUE "COMMON NAME",
# UNCOMMENT THIS LINE OUT.
;duplicate-cn

# The keepalive directive causes ping-like
# messages to be sent back and forth over
# the link so that each side knows when
# the other side has gone down.
# Ping every 10 seconds, assume that remote
# peer is down if no ping received during
# a 120 second time period.
keepalive 10 120

# For extra security beyond that provided
# by SSL/TLS, create an "HMAC firewall"
# to help block DoS attacks and UDP port flooding.
#
# Generate with:
# openvpn --genkey --secret ta.key
#
# The server and each client must have
# a copy of this key.
# The second parameter should be '0'
# on the server and '1' on the clients.
;tls-auth ta.key 0 # This file is secret

# Select a cryptographic cipher.
# This config item must be copied to
# the client config file as well.
;cipher BF-CBC # Blowfish (default)
;cipher AES-128-CBC # AES
;cipher DES-EDE3-CBC # Triple-DES

# Enable compression on the VPN link.
# If you enable it here, you must also
# enable it in the client config file.
comp-lzo

# The maximum number of concurrently connected
# clients we want to allow.
;max-clients 100

# It's a good idea to reduce the OpenVPN
# daemon's privileges after initialization.
#
# You can uncomment this out on
# non-Windows systems.
;user nobody
;group nobody

# The persist options will try to avoid
# accessing certain resources on restart
# that may no longer be accessible because
# of the privilege downgrade.
persist-key
persist-tun

# Output a short status file showing
# current connections, truncated
# and rewritten every minute.
status openvpn-status.log

# By default, log messages will go to the syslog (or
# on Windows, if running as a service, they will go to
# the "\Program Files\OpenVPN\log" directory).
# Use log or log-append to override this default.
# "log" will truncate the log file on OpenVPN startup,
# while "log-append" will append to it. Use one
# or the other (but not both).
;log openvpn.log
;log-append openvpn.log

# Set the appropriate level of log
# file verbosity.
#
# 0 is silent, except for fatal errors
# 4 is reasonable for general usage
# 5 and 6 can help to debug connection problems
# 9 is extremely verbose
verb 6

# Silence repeating messages. At most 20
# sequential messages of the same message
# category will be output to the log.
;mute 20


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 Post subject: Re: DD-WRT client, Ubuntu 10.04 LTS as server
PostPosted: Mon Jan 17, 2011 2:49 pm 
Forum Team
User avatar

Joined: Mon Dec 13, 2010 3:51 pm
Posts: 194
Location: Lawrence, KS
Hello,

Please post your client configuration.

Please use this or something similar to filter it, though :) Also, kick your log verbosity up to at least 4 and post a copy of the generated log.

sed -n -e "/^[#;]/d;/^$/d;p" /etc/openvpn/config.conf

Regards,
Stephen

_________________
[..]I used to think it was awful that life was so unfair. [...]Wouldn't it be much worse if life were fair, and all the terrible things that happen to us come because we actually deserve them? -Marcus Cole


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 Post subject: Re: DD-WRT client, Ubuntu 10.04 LTS as server
PostPosted: Mon Jan 17, 2011 3:52 pm 
OpenVpn Newbie

Joined: Sun Jan 16, 2011 8:35 pm
Posts: 3
I sent you a private message.

I am in a catch 22 right now. When I turn my router on with OpenVPN enabled, I can no longer access the internet or even the router itself. In order to get it out of the mode I disconnect my ADLS moden and unplug/replug my router. When I do that all my log files are gone.

Read the private message and we can go from there.

thanks much,
Kevin


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