好，顶，威武，支持，有希望了！

WHOIS:

$ whois 172.15.0.1
[Querying whois.arin.net]
[whois.arin.net]

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
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# If you see inaccuracies in the results, please report at
# https://www.arin.net/public/whoisinaccuracy/index.xhtml
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#
# The following results may also be obtained via:
# https://whois.arin.net/rest/nets;q=172.15.0.1?showDetails=true&showARIN=false&showNonArinTopLevelNet=false&ext=netref2
#

NetRange: 172.0.0.0 - 172.15.255.255
CIDR: 172.0.0.0/12
NetName: SIS-80-8-2012
NetHandle: NET-172-0-0-0-1
Parent: NET172 (NET-172-0-0-0-0)
NetType: Direct Allocation
OriginAS: AS7132
Organization: AT&T Internet Services (SIS-80)
RegDate: 2012-08-20
Updated: 2012-08-20
Ref: https://whois.arin.net/rest/net/NET-172-0-0-0-1


OrgName: AT&T Internet Services
OrgId: SIS-80
Address: 3300 E Renner Rd
Address: Mailroom B2139
Address: Attn:IP Management
City: Richardson
StateProv: TX
PostalCode: 75082
Country: US
RegDate: 2000-06-20
Updated: 2016-06-17
Comment: For policy abuse issues contact [email protected]
Comment: For all subpoena, Internet, court order related matters and emergency requests contact
Comment: 11760 US Highway 1
Comment: North Palm Beach, FL 33408
Comment: Main Number: 800-635-6840
Comment: Fax: 888-938-4715
Ref: https://whois.arin.net/rest/org/SIS-80


OrgTechHandle: IPADM2-ARIN
OrgTechName: IPAdmin ATT Internet Services
OrgTechPhone: +1-888-510-5545
OrgTechEmail: [email protected]
OrgTechRef: https://whois.arin.net/rest/poc/IPADM2-ARIN

OrgAbuseHandle: ABUSE6-ARIN
OrgAbuseName: Abuse ATT Internet Services
OrgAbusePhone: +1-919-319-8167
OrgAbuseEmail: [email protected]
OrgAbuseRef: https://whois.arin.net/rest/poc/ABUSE6-ARIN

OrgNOCHandle: SUPPO-ARIN
OrgNOCName: Support ATT Internet Services
OrgNOCPhone: +1-888-510-5545
OrgNOCEmail: [email protected]
OrgNOCRef: https://whois.arin.net/rest/poc/SUPPO-ARIN


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# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/public/whoisinaccuracy/index.xhtml


$ whois 11.0.0.0
[Querying whois.arin.net]
[whois.arin.net]

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/public/whoisinaccuracy/index.xhtml
#


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# The following results may also be obtained via:
# https://whois.arin.net/rest/nets;q=11.0.0.0?showDetails=true&showARIN=false&showNonArinTopLevelNet=false&ext=netref2
#

NetRange: 11.0.0.0 - 11.255.255.255
CIDR: 11.0.0.0/8
NetName: DODIIS
NetHandle: NET-11-0-0-0-1
Parent: ()
NetType: Direct Allocation
OriginAS:
Organization: DoD Network Information Center (DNIC)
RegDate: 1984-01-19
Updated: 2007-08-22
Ref: https://whois.arin.net/rest/net/NET-11-0-0-0-1


OrgName: DoD Network Information Center
OrgId: DNIC
Address: 3990 E. Broad Street
City: Columbus
StateProv: OH
PostalCode: 43218
Country: US
RegDate:
Updated: 2011-08-17
Ref: https://whois.arin.net/rest/org/DNIC


OrgAbuseHandle: REGIS10-ARIN
OrgAbuseName: Registration
OrgAbusePhone: +1-844-347-2457
OrgAbuseEmail: [email protected]
OrgAbuseRef: https://whois.arin.net/rest/poc/REGIS10-ARIN

OrgTechHandle: MIL-HSTMST-ARIN
OrgTechName: Network DoD
OrgTechPhone: +1-844-347-2457
OrgTechEmail: [email protected]
OrgTechRef: https://whois.arin.net/rest/poc/MIL-HSTMST-ARIN

OrgTechHandle: REGIS10-ARIN
OrgTechName: Registration
OrgTechPhone: +1-844-347-2457
OrgTechEmail: [email protected]
OrgTechRef: https://whois.arin.net/rest/poc/REGIS10-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/public/whoisinaccuracy/index.xhtml
#

@jasontse 我覺得這和阿里雲把 11.0.0.0/8 這個網段當內網地址用一個道理。

@miaojiang22220 曾经见过把 192.186.0.0/24 当内网地址用的，无语了

@Andy1999 然而 172.15 开头是公网 ip

為何要用如此複雜的方案呢？
標準做法可能是：
將無線路由器劃兩個 VLAN ，即 VLAN1 和 VLAN2 ，再在有線交換機設置一個 trunk 口。
光貓的網線接入 VLAN1 ，你的電腦接入 trunk ，其他用戶的電腦和無線路由器的無線網卡接入 VLAN2 。
將你電腦的有線網卡也劃分 VLAN ，在 VLAN1 上創建 PPPoE 撥號 ppp1 ，給位於 VLAN2 的網卡 eth0.2 設定固定 IP 作為局域網網關（如 192.168.200.1/24 ）
開啟電腦的軟路由功能，配置防火牆允許從 ppp1 和 VLAN2 之間的轉發。
配置 NAPT ，將 VLAN1 發往 ppp1 的包轉換為 ppp1 的公網地址。
在 VLAN2 上配置 DHCP ，地址池需和 eth0.2 位於同一網段，如 192.168.200.100-192.168.200.150 ，網關 192.168.200.1 ， DNS 隨你喜好。

百度没有启用 HSTS ，可以用 sslstrip 方式攻击。
方式，劫持 DNS 到局域网的一台 HTTP 服务器， HTTP 服务器反向代理到 HTTPS 的百度。

或者用 Web 服务器反代 avatar 服务器，并替换 404 结果

再刷新一次就恢复了。多尝试几次有很小的几率再次出现 it works.

两种可能，服务器禁了 ICMP ，或者回程的 ICMP 包被骨干路由丢弃。如果是后者，从服务器反向路由追踪即可知

@kurtrossel
@jq8778
我记得只有联通有这个问题，电信改桥接都是一个电话解决。联通和相比电信，客服水平要差得多。

拿 GitHub 当网盘使。
我记得这种可以举报的，回去看看。

@kurtrossel 其实本质问题一直没有变：他们不给用户选择权，不管开不开路由都是他们说了算。

@xshf12345 猫的无线太垃圾，而且还限制只能连五台设备，简直不能太恶心。

@jyhmijack 新版的 HG220G-U 好像是变了，不过网上应该有人搞定破解方法了，你可以去“老周部落”贴吧看看。