virtual box network how to

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  1. 靜態配置 Host 機器上的 Virtual Box Host only 的網路介面ip : ex:
  2. 配置 Client (VM) 裏頭的兩張介面卡 IP
    1. NAT: (第一個介面, eth0)
    2. Virtual Host Only: (第二個介面, eth3)
  3. 將 Windows 上 的 LAN/Wifi 網路卡開放分享給 Virtual Box Host Only。
  4. Client 裏頭的 routing table

$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default UG 0 0 0 eth0 * U 1 0 0 eth3 * U 1 0 0 eth0

$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_req=1 ttl=58 time=7.33 ms
64 bytes from icmp_req=2 ttl=58 time=7.48 ms
64 bytes from icmp_req=3 ttl=58 time=10.7 ms
— ping statistics —
3 packets transmitted, 3 received, 0% packet loss, time 2004ms
rtt min/avg/max/mdev = 7.336/8.534/10.779/1.591 ms


rtnetlink always triger RTM_NEWLINK periodically on wifi interface

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enable wifi lan (wlan0) by wpa_supplicant, but rtnetlink triger NEW_LINK

wpa_supplicant.conf contains a network but cannot access nor connect, wifi would retry periodically, so RTM_NEWOINK with IFLAG =  IFF_UP | IFF_BROADCAST (0x1003) send to userspace periodically with each trial.


  1. revmoe network from default wpa_supplicant.conf
  2. or set autoscan=period:5  (to set the retry time)
  3. or set sched_scan_plans=sec:trial sec:trial …

If sched_scan_plans are configured and supported by the driver, autoscan is ignored.


transfer iOS App distribution privilage.

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1. each distribution certificate binds with a private key which is used to generate the certificate from Keychain.
2. export the private key described with 1.
3. import the exported private key described with 2. in new developer’s Mac OS.
4. new developer should down load the distribution certificate from iOS Dev Center. (of course the developer should be invited as a member of team of development before all).

Mac OS X mavericks with Subversion + Apache

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  1. should rebuild subversion to x86_64 architecture
    • make link for Xcode, because subversion detect build tool chain with a specific rule but Mavericks as no such path for Xcode.

% sudo ln -s /Applications/  /Applications/

    • download svn (v1.8.3) download svn 1.6.18 (1.8.3 cannot work)
    • make and make install
% cd ~/Downloads/subversion-1.6.18
% cd ./configure
% make
    • copy and to /usr/libexec/apache2 or anywhere you want to locate the module binary files, this would be referenced in httpd_server_app.conf for Web Server.

% cp subversion/mod_dav_svn/.libs/ /usr/libexec/apache2

% cp subversion/mod_authz_svn/.libs/ /usr/libexec/apache2

  1. in /Library/Server/Web/Config/apache2/httpd_server_app.conf
    • add

LoadModule dav_svn_module libexec/apache2/
LoadModule authz_svn_module libexec/apache2/

    • notice the order, if loaded after, you got the error as launch web server.

httpd: Syntax error on line XXX of /Library/Server/Web/Config/apache2/httpd_server_app.conf: Cannot load /usr/libexec/apache2/ into server: dlopen(/usr/libexec/apache2/, 10): Symbol not found: _dav_svn_split_uri\n  Referenced from: /usr/libexec/apache2/\n  Expected in: flat namespace\n in /usr/libexec/apache2/