p=reject in DMARC policy

Give a big hand to Yahoo and Paypal for their "p=reject" in DMARC policy.

[root@localhost ~]# dig -t txt _dmarc.yahoo.com +short
"v=DMARC1\; p=reject\; pct=100\; rua=mailto:dmarc_y_rua@yahoo.com\;"
[root@localhost ~]# dig -t txt _dmarc.paypal.com +short
"v=DMARC1\; p=reject\; rua=mailto:d@rua.agari.com\; ruf=mailto:dk@bounce.paypal.com,mailto:d@ruf.agari.com"

Network Geek

Address and physical address can mean very different things in the minds of network geeks.

Goodbye Sendmail !

Goodbye Sendmail. You had been with me since 1998. Thanks for serving me for the past 18 years.  

Your rock stable performance should surprise the Internet technical community.  However, I need something more versatile, administrator-friendly and easy to debug.  

Bluetooth Tethering

I suppose all people who have multiple smartphones and tablets know how to do Bluetooth tethering.  This is important because WiFi tethering can not be done in some prepaid data cards.

misuse of high gain antennas

I want to kill myself for making a silly mistake. My ASUS router supports dual bands and 802.11ac. However, I use 8 dBi high gain antennas which suit the 2.4 GHz band only. While the signal strength in the garbage 2.4 GHz band is boosted to - 30 dBm, the 5 GHz signal strength is weakened significantly. That is why all my 802.11ac client devices perform poorly. I promise myself not to commit such mistake in future.