sskaje's blog, study & research on technology
Distract the Guards =================== The time for the mass escape has come, and you need to distract the guards so that the bunny prisoners can make it out! Unfortunately for you, they’re watching the bunnies closely. Fortunately, this means they haven’t realized yet that the space station is about to explode due to the destruction … Continue reading “Google’s Foo.bar: Distract the Guards”
I tried a simple way in my very first solution, only two test cases passed. Then I google’d other ppl’s test cases, and found this. This challenge is about mathematics, not traditional algorithms. Thanks to this, I learned Markov Chains and Absorbing Markov Chains. Thanks to @patrickJMT for his videos on youtube. All test cases, … Continue reading “Google’s Foo.bar: Doomsday Fuel”
I’m using 4G by China Mobile, but the DNS it provides really sucks. Changing DNS from Cellular Data on a not-jailbroken iPhone is impossible so far as I know (I tried mobileconfig but can find any working options). The first idea is pushing DNS from a PPTP server, which I wrote: Notes: PPTP/L2TP Server on … Continue reading “OpenConnect DNS Only + Google Only”
Google introduces its TXT/spf records including all Google’s IP: Google IP address ranges
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# dig google.com TXT ... google.com. 3579 IN TXT "v=spf1 include:_spf.google.com ip4:216.73.93.70/31 ip4:216.73.93.72/31 ~all" ... |
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# dig _spf.google.com TXT ... _spf.google.com. 154 IN TXT "v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ~all" ... |
_netblocks.google.com describes ipv4 ranges.
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# dig _netblocks.google.com TXT ... _netblocks.google.com. 2468 IN TXT "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ~all" ... |
_netblocks2.google.com describes ipv6 ranges
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# dig _netblocks2.google.com TXT ... _netblocks2.google.com. 2495 IN TXT "v=spf1 ip6:2001:4860:4000::/36 ip6:2404:6800:4000::/36 ip6:2607:f8b0:4000::/36 ip6:2800:3f0:4000::/36 ip6:2a00:1450:4000::/36 ip6:2c0f:fb50:4000::/36 ~all" |
_netblocks3.google.com is currently empty. Now we have list of IPv4 ranges, but we know google provides a public dns service, 8.8.8.8/8.8.4.4 (for ipv6 2001:4860:4860::8888/2001:4860:4860::8844). we can treat these two as … Continue reading “Google IP Address Ranges”
I found some ways making most of google’s services working in my working place, but not for google docs, google drive, google plus… I got a VPS somewhere, windows 2003, which is quite easy creating a port proxy. Steps: Make sure you have 443 port not in use. Install IPv6 To make the portproxy work … Continue reading “Set up Port Proxy for Google”