# Virtualbox cross host network communication failure **URL:** \ **Category:** Rancher 1.x\ **Created:** [July 5, 2016, 7:47pm UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321 "2016-07-05T19:47:12Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![courcelm](https://avatars.discourse-cdn.com/v4/letter/c/a8b319/32.png) [@courcelm](https://forums.suse.com/u/courcelm)\ **Post date:** [July 5, 2016, 7:47pm UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/1 "2016-07-05T19:47:12Z")
I’m having issue with cross host communication with virtual box. I have two Windows 7 computers where I installed docker-toolbox and then started rancher/os. I open ports UDP 500 and 4500 in Virtualbox NAT. I started the rancher-agent in both node. Both host registered correctly in rancher server. However containers between these two hosts can not ping each other? I’m I missing a configuration? Is is possible to have this setup? Thanks! ---
**Author:** ![leodotcloud](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/leodotcloud/32/3103_2.png) [@leodotcloud](https://forums.suse.com/u/leodotcloud)\ **Post date:** [July 5, 2016, 8:48pm UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/2 "2016-07-05T20:48:59Z")
Are you hitting this issue: [How to get Rancher overlay network working locally](http://forums.suse.com/t/how-to-get-rancher-overlay-network-working-locally/3044/10) ---
**Author:** ![courcelm](https://avatars.discourse-cdn.com/v4/letter/c/a8b319/32.png) [@courcelm](https://forums.suse.com/u/courcelm)\ **Post date:** [July 6, 2016, 1:03am UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/3 "2016-07-06T01:03:52Z")
Hello Leodotcloud, I’m using Rancher/OS as indicated in the documentation: $ docker-machine create -d virtualbox --virtualbox-boot2docker-url [https://releases.rancher.com/os/latest/rancheros.iso](https://releases.rancher.com/os/latest/rancheros.iso) The issue you are referring use boot2docker. Is it know to affect rancheros.iso too? ---
**Author:** ![courcelm](https://avatars.discourse-cdn.com/v4/letter/c/a8b319/32.png) [@courcelm](https://forums.suse.com/u/courcelm)\ **Post date:** [July 6, 2016, 1:26am UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/4 "2016-07-06T01:26:54Z")
Into /var/log/charon.log, I do have the reported error: [CFG] trap not found, unable to acquire reqid 1234 ---
**Author:** ![leodotcloud](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/leodotcloud/32/3103_2.png) [@leodotcloud](https://forums.suse.com/u/leodotcloud)\ **Post date:** [July 6, 2016, 1:28am UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/5 "2016-07-06T01:28:10Z")
Nope the issue is related to boot2docker. Did you open the ports in the Windows 7 firewall? ---
**Author:** ![courcelm](https://avatars.discourse-cdn.com/v4/letter/c/a8b319/32.png) [@courcelm](https://forums.suse.com/u/courcelm)\ **Post date:** [July 6, 2016, 1:36am UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/6 "2016-07-06T01:36:27Z")
Ports are open. Cross host communication between one Linux host and Windows 7 host/Virtualbox/RancherOS works fine. I can ping Network Agent from Network Agent. Ping is not working from Network Agent to Network Agent between two computers with both Windows 7 host/Virtualbox/RancherOS . ---
**Author:** ![courcelm](https://avatars.discourse-cdn.com/v4/letter/c/a8b319/32.png) [@courcelm](https://forums.suse.com/u/courcelm)\ **Post date:** [July 8, 2016, 1:15pm UTC](https://forums.suse.com/t/virtualbox-cross-host-network-communication-failure/3321/7 "2016-07-08T13:15:02Z")
I booted one VM Ubuntu 16.04 LTS with virtualbox on each computer and opened the ports UDP 400/4500. Still having the communication problem between the two hosts. Not an issue with the Rancher/OS.