Bridged network only gets UDP broadcast traffic?

I've created a bridged network Mac OS X 10.8.5 using ifconfig and TUNTAP for OS X to bridge my wireless connection, en0, with a virtual interface, tap0, which I can use for guest VMs:
        $ sudo sysctl -w net.inet.ip.forwarding=1
        $ sudo sysctl -w net.link.ether.inet.proxyall=1
        $ sudo sysctl -w net.inet.ip.fw.enable=1
        $ sudo ifconfig bridge0 create
        $ sudo ifconfig bridge0 addm en0 addm tap0
        $ sudo ifconfig bridge0 up
        $ ifconfig
        en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
                  ether 28:cf:xx:xx:xx:xx
                  inet6 xxxx::xxxx:xxxx:xxxx:xxxx%en0 prefixlen 64 scopeid 0x4
                  inet 192.168.100.64 netmask 0xffffff00 broadcast 192.168.100.1
                  media: autoselect
                  status: active
        bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
                  ether ac:de:xx:xx:xx:xx
                  Configuration:
                            priority 0 hellotime 0 fwddelay 0 maxage 0
                            ipfilter disabled flags 0x2
                  member: en0 flags=3<LEARNING,DISCOVER>
                           port 4 priority 0 path cost 0
                  member: tap0 flags=3<LEARNING,DISCOVER>
                           port 8 priority 0 path cost 0
        tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
                  ether ca:3d:xx:xx:xx:xx
                  open (pid 88244)
I'm using this with QEMU and the guest VM never gets a DHCP lease. If I `tcpdump -i tap0`, I only see broadcast traffic. Shouldn't I see a mirror of everything on en0? (192.168.100.33, the host doing the broadcasting, is another unrelate, noisy server on my LAN.)
Any ideas?

IGMP snooping may be enabled by default on the 6509. Disabling it may solve your problem.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/snooigmp.htm#wp1020466

Similar Messages

UDP Broadcast Traffic from Cisco ASA

Hi,
I want to know that, like Cisco IOS Router, Does Cisco ASA pass the UDP Broadcast traffic e.g., TFTP etc...?
Any thoughts ???
BR,
Mubasher Sultan

Hi Mubasher,
Unlike the router the ASA does not forward any kind of broadcast packet (with the exemption of the DHCP broadcasts when DHCP Relay is enabled).
I understand that your DHCP server is providing here the IP address for your TFTP servers. I guess you are using DHCP option 150.
So if the DHCP server is on one interface and the client is on another you can configure DHCP Relay on your ASA.
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a008075fcfb.shtml
In regards of the TFTP requests these will be normal unicast packets as Cadet said so just make sure that you have the proper ACLs and NAT rules for that.

UDP broadcast traffic on port 4554 from Wireless Access Points

Hello,
I am seeing a lot of broadcast traffic coming from my AP541N-A-K9 access points at port 4554/UDP . I have 5 of these in a cluster. I cant seem to find anything in the manual in regards to this port traffic. Any help is apprecieted

Hi
I found this reference for this. As per this it is used for "internal use"
https://www.cisco.com/assets/sol/sb/WAP561_Emulators/WAP561_Emulator_v1.0.4.4/device_info.html
HTH
Rasika
**** Pls rate all useful responses ****

Getting Broadcast traffic from one 3745 to another

The topology is simple. Three 3550 switches as the backbone tied together using spanning-tree layer 2 wire speed switching. Very simple stuff there. Introduce 3745 access routers, one attached to each 3550, each loaded with 16port ESW, 1 GigE GBic card, and a 8A/S card.
The problem is we have systems that blow out broadcast traffic that needs to traverse accross all 16-ESWs. We have tried all manor of things but we can not get broadcast traffic to traverse the 1GE port. We can see packets hitting the interface but they are simply getting dropped on the floor.
I can go into more detail if needed but we think we're missing a painfully simple detail. Perhaps something to do with L3 and L2? Perhaps something to do with bridge groups or vlans or helper protocols?
Any wisdom to help us out would be greatly appreciated!

Dwayne
As you probably already know, the helper-address is configured on the interface that receives the broadcast to be forwarded. So if the broadcast source is in a 16ESW then I would expect the helper address to be configured on whatever interface (probably virtual) repersents the layer 3 interface for those layer 2 ports.
The function of helper address is that it takes a broadcast packet and forwards to some destination address. The general assumption is that the destination address will be unicast. The destination address can be a subnet broadcast (directed broadcast) and I assume that this is what you are trying to do. Is this correct? If so then be sure that you have ip directed-broadcast enabled on the interface where the destination subnet is located.
Another potential issue is identification of broadcast packets to be forwarded. Helper address is not intended to forward ALL broadcasts. There is a group of protocols that are enabled by default (DHCP, TFTP, etc). If the broadcast packets that you want to forward are not one of these default protocols then you need to use the ip forward-protocol udp command which would be configured on the interface receiving the initial broadcast (the same interface as the helper-address).
You probably have these already. But I can not find a good description of what is configured where and thought that a review of these principles might be helpful.
It probably would be quite helpful to post configs of at least one 3745 and also its associated 3550. If you do not want to post these on the forum please feel free to EMail them to me. My EMail address is available from my forum profile.
HTH
Rick

As soon as I keep the iPhone (iPhone 5) on the desk the network goes off and when I swipe it then only it starts searching for the network and get it in 30 seconds. If someone is calling me during that time it says mobile is either switched off or outsid

As soon as I keep the iPhone (iPhone 5) on the desk the network goes off and when I swipe it then only it starts searching for the network and get it in 30 seconds.
If someone is calling me during that time it says mobile is either switched off or outside the coverage area.
Please help

You may need to force it into recovery mode. See here: https://discussions.apple.com/message/17766427#17766427

Networked user logs in and only gets dock and spotlight icon

Here's the deal: I have a networked user (PHD) that logs in the only gets her dock and spotlight icon to come up. The rest of the menu bar at the top is missing. If you click on an icon in the dock it bounces and trys to open but never does and quits. Any ideas? This has happened before to two other users of mine using the same type of computer (2.0ghz 20in iMac G5) With the other two I was very busy so I just dropped our editorial image/clone on there and that fixed it. What is weird about this is that the user can log in on another computer fine and different users can log in on that computer fine. The computer is running 10.4.4 and the xserve is running 10.3.9
Thanks!

well its created by using bad fonts at one time in your system - or fonts that do not exist on a local volume. when you load a font that is bad and may conflict with a current font etc the system encounters problems - upon reboot the "font cache" remembers this font and doesnt initialize the window server properly. the other case i mentioned is when i loads up and tries to load the font that was cached but was loaded into suitcase or some font management from a cd or network volume. the volume is not available and then the user login fails to finish... been a problem ever since 10.4 came out. 10.3 had its own way of showing the same issue.

5ghz Network only way to get 300 mbits?

Just upgraded to one of the new TCs. Most of my wireless tech is b/g but a few of my items, MBP and Xbox have N cards. If I want the fastest speeds possible for those I need to go in and enable the 5ghz network right? Cause after setup i am only connecting @ 130bits. Thanks.

The 300 mbps is a theoretical maximum connection speed and not something you are likely to achieve in practice. With all 802.11x wireless technologies, the router and computer will automatically reduce the connection speed to maintain a reliable connection as the signal strength falls. You'll only get 300 mbps if the computer and router are next to each other. Thus, whilst enabling 5GHz may increase your speed, you are unlikely to achieve 300 mbps and may well get no more than you currently get at 2.4GHz. I have a new Airport Extreme and am currently connection to my iMac at "only" 108mbps - and occasionally at up to 160 mbps - using 5GHz.

M trying to add a printer to my extreme network however i only get the basic airport utility screen when I click on airport utility ??? Am I going crazy

m trying to add a printer to my extreme network however i only get the basic airport utility screen when I click on airport utility ??? Am I going crazy

OS X Mountain Lion: Set up a printer to print wirelessly
OS X: Connecting a Wi-Fi printer to your Wi-Fi network

Just one month before i bought iphone 5... but the iphone has the internet connectivity problem... while a iphone 4s is cathcing 3G tower, whereas iphone 5 is catching 2G network only.... I've tried so many things to get recovered, but alas

Just one month before i bought iphone 5... but the iphone has the internet connectivity problem... while a iphone 4s is cathcing 3G tower, whereas iphone 5 is catching 2G network only.... I've tried so many things to get recovered, but alas, nothing is workable- such as- restaring the iphone, reseting the networks etc... Please help me out from this problem..

to be clear, my phone works fine when not in motion in a vehicle. If I pull over and come to a complete stop, remaining in the car, my phone works.
And while the phone is not working when I'm in motion, an internet search or a text message will go through, but I can not use Siri or any voice assistance when doing the text message or internet search. The microphone is greyed out.
So this is a unique issue, which appears to be the iPhone and not Verizon.

Time Capsule firewall allows broadcast traffic

It appears that Time Capsule will forward broadcast traffic from the LAN side to WAN and allow responses back. I would have thought that when the Router Mode was set to "DHCP and NAT" that this wouldn't happen. It seems like this might be a security flaw.
Here's my setup, and why I believe this is the case:
Comcast Xfinity service -> Motorola SB6121 -> Time Capsule (latest generation 7.6.1 software) -> Netgear GS116 -> home network with airport express and various hard-wired and WiFi devices.
The SB6121 cable modem is wired direclty to the WAN port on the Time Capsule. And then the first LAN port on the Time Capusule is wired direclty the Netgear switch. And then everything else is wired directly to the Netgear switch. The Time Capsule's DHCP server is set to hand out addresses in the 172.16.0.2 to 172.16.0.200 range and so everything in my home network should be getting addresses in that range.
The SB6121 is not a gateway or router - its just a modem, but does still have a weird little DHCP server that is supposedly only active when the cable service is dead, but in practice (at least for me) seems to always be on. And there's no way to turn it off, at least from my end - perhaps Comcast could, but that's a black hole. This weird little DHCP server is hard-wired to hand out addresses between 192.168.100.11 and 192.168.100.42 and there's no way to configure it differently.
What I see though I (which makes me think there is a security flaw in the Time Capsule firewall) is that DHCP requests from my home network are sometimes answered by the SB6121's DHCP server instead of the Time Capsule's. I say "sometimes" because most of my Apple equipment (laptops, iPhones, iPads and a Mac Mini) get configured with 172.16.0.X addresses. But most non-Apple equipment is getting 192.168.100.X addresses - this includes a Denon AV reciever and Comcast cable box. But I also have an Airport Express (latest version, 7.6.2 software) - its Router Mode is set to "Off (Bridge Mode)", but if its Internet -> Connect Using: is set to DHCP it also gets a 192.168 address.
I thought maybe it was just the hard-wired devices getting the 192.168 addresses, but they're not. The Mac Mini is hardwired and gets the right address range. And then I thought that all WiFi devices were getting 172.16 addresses, but they're not. I have a "Nest" thermostat that connects to the WiFi and gets a 192.168 address.
Obviously there are several problems here - having multiple DHCP servers on a network is a recipe for disaster. But it seems to me that the Time Capusule is mis-behaving. The weird little DHCP server on the cable modem on the WAN side of the Time Capsule shouldn't be accessible from my home network. The Time Capsule shouldn't be passing broadcast DHCPDiscover packets from the LAN side through to the WAN side.
I've been all through the Time Capsule settings and don't see a way to further lock down the WAN-LAN connection. I suppose I could get a managed switch or "real" firewall to stick between the cable modem and the Time Capsule and use it to block traffic, but I shouldn't have to. And I suppose I could ask Comcast to disable the DHCP server on the cable modem, but I don't have the fortitue to sit on hold for hours trying to explain it to them. Or I suppose I could get a different cable modem that doesn't have the silly DHCP server, and maybe that's the ultimate answer, but I still think the Time Capsule has a flaw.
I got the SB6121 plus Time Capsule combination specifically because I didn't want fidgety stuff to deal with. I could have gotten a router supporting DD-WRT if I wanted to play network engineer at home, but I do that at work and just wanted something I didn't have to debug or think about.
Anybody in a similar situation or have suggestions?
If you got this far, thanks for listening.
-dave.
(Oh yeah, I swapped the Time Capsule with the Aiport Express -- latest model with WAN and LAN ports -- and got the exact same behavior. I suspect that all Airport models just treat the multple ethernet ports as a dumb layer two switch and blindly forward ethernet broadcast traffic from one port to all the others.)

Thanks for reporting this.. I think you should advise Apple of this flaw.. It is a serious flaw.
The cable modems are always made with local IP address so you can check the settings and the DHCP in them is designed for using a block of public IP addresses.. ie.. if you were extremely rich.. you buy a block of IP addresses from the ISP, plug the modem directly to a switch. And every client that joined would get a public IP address. Since the ISP are not that generous as to actually hand out more than one IP, (our local cable ISP in Australia, Telstra actually gives out 3 for free). The modem however will switch from public to private IP address when it does so, once the first address is allocated. There is no security risk as that private IP has no internet connection. (Test it and see, but any device getting 192.168 address should have no internet connection). The Modem has no NAT.. so it is purely for internal purposes.
When you tested the Airport Express, did you set it up to 172.16.x.x range as well?
Could you please test if you haven't already the TC at its native IP address and range?
Domestic routers often fail to work properly if used off their default range.. somewhere in the coding they have fixed some addressing, instead of correctly using settings you put in. This is not at all unusual actually. My advice to people is always stick with default unless you really want some pain.
If you are happy with pain, I would ensure all names are set to SMB standard.. as it sounds like you know networks I presume you would already do this. Apple names are ghastly things.
Stick to short, no spaces, pure alphanumeric names for everything.
Make sure the dhcp range includes enough addresses that it cannot run out..the normal standard is 2-200.
If the lease time is set to 1day default, set it to 20min.
I would also turn off ipv6 (maybe only possible on the client). That does seem to lead to confusion.
If necessary you should be able to use static IP reservation via the dhcp setting in the TC.. that might also help.
Are you running a 5.6 utility to do the setup?? If not you must!!
You can load it even into Mountain Lion with a bit of fiddling.
Check logs and setup the reservation for any devices failing to get IP correctly.
And yes, in the end you may have to simply use a more standard router.. and hive off the TC to bridged role.

QEMU/KVM bridge networking howto

Hello all,
I had a dialog here: https://bbs.archlinux.org/viewtopic.php?id=145177 but I inadvertently hijacked the OP thread, for that I deeply apologize and decided to start my own thread.
I've been struggling with getting my bridge networking working with QEMU/KVM. I would love to get my KVM Windows 7 install working with bridge network so I can access my internal lan, but so far I am out of luck. When I follow the Wiki's I completely hose my network settings and can't get online with my Arch host.
I've followed the wiki's here:
https://wiki.archlinux.org/index.php/QE … al_network
should I be using this wiki instead:
https://wiki.archlinux.org/index.php/KV … Networking
I'm kinda confused on how to approach this since there are separate wikis for QEMU and KVM.
I have a couple of confusing questions, that I hope someone can answer, or lead me in a direction to help me find a solution. Free internet beer for helping.
From a vanilla install of Arch, if I would like to run Windows 7 64-bit in a VM, should I use QEMU or KVM? I did get the windows 7 up and running, not sure how, but it's not on my internet LAN, the VM can only access the internet.
Can someone help me out step by step or pointing me in a direction that can help get a bridge network set up between my host, which will need a static IP address, and my VM, which I would prefer to have another static IP address on my network.
I've tried using virtualbox but the performance was slower than using QEMU/KVM.
BTW, what's the difference between QEMU and KVM? I'm confused by that as well. I would even be willing to write up a "beginners guide" if I can get help getting mine set up.
any help is greatly appreciated.
--nixIT

I do things manually on my system so, for two VM:
ip tuntap add dev tap0 mode tap user djgera
ip tuntap add dev tap1 mode tap user djgera
brctl addbr br0
brctl setfd br0 0.0
brctl addif br0 eth0
brctl addif br0 tap0
brctl addif br0 tap1
ip link set dev br0 up
ip link set dev tap0 up
ip link set dev tap1 up
ip addr del 192.168.0.77/24 dev eth0
ip addr add 192.168.0.77/24 broadcast + dev br0
ip route add default via 192.168.0.1
then each qemu-kvm instance that I lauch add:
-device virtio-net-pci,netdev=net0,mac=52:54:00:12:34:00 -netdev type=tap,id=net0,ifname=tap0,script=no,downscript=no
-device virtio-net-pci,netdev=net1,mac=52:54:00:12:34:01 -netdev type=tap,id=net1,ifname=tap1,script=no,downscript=no

[SOLVED] KVM and Bridged Networking

I've got KVM working and a Windows 2008 server installed on a image now, but it's only getting a NAT ip address. I need to get this server onto my main network, on Windows I'd use Virtual Box and Bridged Networking, but I thought I'd give KVM a try out.
I've followed the setup at https://wiki.archlinux.org/index.php/KV … Networking
Using Netcfg
Bridged networking is used when you want your VM to be on the same network as your host machine. This will allow it to get a static or DHCP IP address on your network, and then you can access it using that IP address from anywhere on your LAN. The preferred method for setting up bridged networking for KVM is to use the netcfg package. You will also need to install bridge-utils.
Netcfg#Configuring_a_bridge_for_use_with_virtual_machines_.28VMs.29
And this page https://wiki.archlinux.org/index.php/Ne … _.28VMs.29
I've got a bridge working I believe (all my stuff is DHCP by the way)
Output of ifconfig
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 metric 1
inet 192.168.1.52 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::21d:7dff:fea9:bb2f prefixlen 64 scopeid 0x20<link>
ether 00:1d:7d:a9:bb:2f txqueuelen 0 (Ethernet)
RX packets 2966 bytes 520670 (508.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2351 bytes 1874150 (1.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500 metric 1
ether 00:1d:7d:a9:bb:2f txqueuelen 1000 (Ethernet)
RX packets 2977 bytes 570261 (556.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2364 bytes 1875202 (1.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 45 base 0xc000
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 16436 metric 1
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 72 bytes 7056 (6.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 72 bytes 7056 (6.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I've got "bridge" added to my rc.conf as a MODULE which is loaded. (I saw reference to this somewhere else on the forum that this might be needed)
I'm starting my VM with the following command
qemu-kvm -vnc 192.168.1.52:0 -hda Nekomi -m 2048 -smp 2 -net nic
Yet I still can't get an IP outside of the 10.0.0.0 range on the VM.
The VNC line above is because the HOST has not VGA output at all, completely headless.
I'm trying to get this working and trying to learn at the same time. KVM is new to me, as is bridged networking on linux.
Any ideas? Thanks
Last edited by Naijeru (2012-09-18 16:28:20)

Sorry for the delay, bit a PC rebuild occurred :-(
Anyway, I managed to get this working with steps #1-#7 from the linked section. Thanks for that. I did have a few minor issues in getting a DHCP on the host machine itself, turns out I'd missed a single ) from the daemons section of rc.conf. A human error, but difficult to fix as the machine was rendered off the network and without a VGA card... fun!
I diverge, I have this script to bring up a bridge when the qemu-kvm starts
#!/bin/sh
echo "Executing /etc/qemu-ifup"
echo "Bringing up $1 for bridged mode..."
sudo /sbin/ifconfig $1 0.0.0.0 promisc up
echo "Adding $1 to br0..."
sudo /usr/sbin/brctl addif br0 $1
sleep 2
But when the kvm shutdowns it complains it can't find qemu-ifdown script. So I'm thinking of making one but just want to check it over first.
#!/bin/sh
echo "Executing /etc/qemu-ifdown"
echo "Removing $1 from br0..."
sudo /usr/sbin/brctl delif br0 $1
echo "Taking down $1 from bridged mode..."
sudo /sbin/ifconfig $1 0.0.0.0 promisc down
sleep 2
I've reversed the logic here, is the above the correct way to bring down the guest interface?

Tap0.device issues while attempting to start bridged network

i'm trying to get the bridged network working so i can run xen and everytime i try sudo netctl enable xenbridge-dhcp i get this error in journalctl.
-- Logs begin at Wed 2013-05-15 14:16:16 PDT, end at Tue 2013-05-28 18:26:42 PDT. --
May 28 18:25:07 kimbra sudo[23762]: pam_unix(sudo:session): session closed for user root
May 28 18:25:12 kimbra sudo[23764]: jd : TTY=pts/1 ; PWD=/home/jd ; USER=root ; COMMAND=/usr/bin/netctl start xenbridge-dhcp
May 28 18:25:12 kimbra sudo[23764]: pam_unix(sudo:session): session opened for user root by (uid=0)
May 28 18:25:12 kimbra systemd[1]: Expecting device sys-subsystem-net-devices-tap0.device...
-- Subject: Unit sys-subsystem-net-devices-tap0.device has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/li … temd-devel
-- Unit sys-subsystem-net-devices-tap0.device has begun starting up.
May 28 18:26:42 kimbra systemd[1]: Job sys-subsystem-net-devices-tap0.device/start timed out.
May 28 18:26:42 kimbra systemd[1]: Timed out waiting for device sys-subsystem-net-devices-tap0.device.
-- Subject: Unit sys-subsystem-net-devices-tap0.device has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/li … temd-devel
-- Documentation: http://www.freedesktop.org/wiki/Softwar … e9d022f03d
-- Unit sys-subsystem-net-devices-tap0.device has failed.
-- The result is timeout.
May 28 18:26:42 kimbra systemd[1]: Dependency failed for xen bridge.
-- Subject: Unit netctl@xenbridge\x2ddhcp.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/li … temd-devel
-- Documentation: http://www.freedesktop.org/wiki/Softwar … e9d022f03d
-- Unit netctl@xenbridge\x2ddhcp.service has failed.
-- The result is dependency.
May 28 18:26:42 kimbra sudo[23764]: pam_unix(sudo:session): session closed for user root
tap0.device is not working and i can't find the uml_utilities package anywhere.
help?

Sorry for the rather late response, but I've just been through this issue myself. The tunctl & brctl utilities are now part of 'uml_utliities', which is itself deprecated.
I downloaded uml_utilities and installed it.
I've encountered a bug which appears to be common to all bridged netwroking (the inbuilt VirtualBox bridging demonstrates the same problem). The nature of the bug is that if I bridge with the physical ethernet adapter, only a linux guest VM can see the outside world. THis is true whether the guest is running under VirtualBox or KVM so the issue appears to be generic.
Non-linux guests can see each other and the *host*, but not the rest of the world. Speculations as to the reason include the deprecation of Uml_Utilities, but regardless, I tried something different.
I created the bridge and assigned it a separate subnet. I added some tap interfaces. I ran a DHCP server instance listening on the bridge alone. I set forwarding on, and created a static route enabling my router to find the virtual subnet.
I used dnsmasq for the DHCP as it isn't used by my regular network setup, meaning that I can screw around with it trivially without breaking things. Additionally, I set up the config automatically from my vnet script. I can potentially add multiple virtual subnets this way although I haven't included support in the script as yet. The minimal config hands out addresses from the pool specified on the vnet command line, and I can set up static addresses on the same subnet by referencing the contents of /etc/host and /etc/ethers (it identifies vms by mac address).
This works perfectly, and has the advantage that the virtual network traffic will route via wireless as well as cabled ethernet. It also makes it simple to firewall the virtual subnet and reduces the risk of experiencing minor hassle when my broken vnet code stuffs the ethernet interface.
Ping me if you want a copy of the vnet script, although it's still very much a work in progress.
Last edited by salafrance (2013-09-21 20:02:12)

Why WRT54G ver 7 blocks all UDP broadcasts?

My WRT54G seems to be blocking all UDP broadcasts in the intranet side. Is there an option somewhere, which controls this behaviour, because I have not found one.
It does not matter, if I connect my laptop with a cable or by WLAN, no UDP broadcast packets from my server to the laptop go through.
If I connect to either one of my regular switches, UDP broadcast works perfectly.
Note that I'm not using the WAN port at all, so I would expect no filtering on the traffic.

Interesting!
For sake of argument, can you try using the broadcast address of 255.255.255.255 - this is a limited (local network only) broadcast.
Can you see the MAC (layer 2/ethernet) portion with your tool?
The MAC of the destination needs to be all FFs (all ones) for broadcasts.
I am wondering if something is happening at a lower level - like in how switching is implemented in the linksys. I wonder if a linksys switch (only) also does this.
NOTE - ICMP echo (PINGS) do go through my WRV54G to specific addresses and broacdcast the x.x.x.255 addresses.

(SOLVED) Virtualbox bridged network, windows host, arch guest

I am trying to get my archlinux guest's network working again. It was working before I bridged the connection and changed the adaptor to the bridged one, but I want a bridged connection for certain reasons, so I want it working. This is the result I get when I use sudo dchcpcd eth0:
dhcpcd: version 5.0.7 starting
dhcpcd: eth0: rebinding lease of 10.0.2.15
dhcpcd: eth0: broadcasting for a lease
dhcpcd: eth0: offered 192.168.0.199 from 192.168.0.1
dhcpcd: eth0: acknowledged 192.168.0.199 from 192.168.0.1
dhcpcd: eth0: checking for 192.168.0.199
dhcpcd: eth0: hardware address 00:le:8c:85:a6:4d claims 192.168.0.199
dhcpcd: eth0: send_raw_packet: Bad file descriptor
dhcpcd: eth0: rebinding lease of 10.0.2.15
dhcocd: timed out
I have no clue why it's not working, but I am sort of new to linux and virtual machines. Still, can anyone help me get the bridged connection working?
EDIT: Nevermind, I fixed it.
Last edited by Shade Vortex (2009-09-08 14:48:50)

All I did was unbridge my windows network. You only select the bridged network from virtualbox, don't manually bridge your network!
If you windows network is not bridged with your vm's host only network in the windows networking page, then I dunno what your problem is.

Bridged network only gets UDP broadcast traffic?

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