分类目录归档：关于网络

保留IP地址

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IPv4保留地址

Special address blocks
Address block Address range Number of addresses Scope Description
0.0.0.0/8 0.0.0.0–0.255.255.255 16777216 Software Current (local, "this") network[1]
10.0.0.0/8 10.0.0.0–10.255.255.255 16777216 Private network Used for local communications within a private network[3]
100.64.0.0/10 100.64.0.0–100.127.255.255 4194304 Private network Shared address space[4] for communications between a service provider and its subscribers when using a carrier-grade NAT
127.0.0.0/8 127.0.0.0–127.255.255.255 16777216 Host Used for loopback addresses to the local host[1]
169.254.0.0/16 169.254.0.0–169.254.255.255 65536 Subnet Used for link-local addresses[5] between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server
172.16.0.0/12 172.16.0.0–172.31.255.255 1048576 Private network Used for local communications within a private network[3]
192.0.0.0/24 192.0.0.0–192.0.0.255 256 Private network IETF Protocol Assignments, DS-Lite (/29)[1]
192.0.2.0/24 192.0.2.0–192.0.2.255 256 Documentation Assigned as TEST-NET-1, documentation and examples[6]
192.88.99.0/24 192.88.99.0–192.88.99.255 256 Internet Reserved.[7] Formerly used for IPv6 to IPv4 relay[8] (included IPv6 address block 2002::/16).
192.168.0.0/16 192.168.0.0–192.168.255.255 65536 Private network Used for local communications within a private network[3]
198.18.0.0/15 198.18.0.0–198.19.255.255 131072 Private network Used for benchmark testing of inter-network communications between two separate subnets[9]
198.51.100.0/24 198.51.100.0–198.51.100.255 256 Documentation Assigned as TEST-NET-2, documentation and examples[6]
203.0.113.0/24 203.0.113.0–203.0.113.255 256 Documentation Assigned as TEST-NET-3, documentation and examples[6]
224.0.0.0/4 224.0.0.0–239.255.255.255 268435456 Internet In use for multicast[10] (former Class D network)
233.252.0.0/24 233.252.0.0–233.252.0.255 256 Documentation Assigned as MCAST-TEST-NET, documentation and examples (Note that this is part of the above multicast space.)[10][11]
240.0.0.0/4 240.0.0.0–255.255.255.254 268435455 Internet Reserved for future use[12] (former Class E network)
255.255.255.255/32 255.255.255.255 1 Subnet Reserved for the "limited broadcast" destination address[1]

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路由器MTU值优化

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MTU，即最大传输单元，其是网络传输的最大信息包值，一般路由器的MTU值是默认值，更改MTU值可提高路由器的效率，但MTU值超过ISP要求将无法进行传输，所以可以使用下面方法取得最佳MTU值，并且设置到路由器中。

修改路由器的MTU值可以解决部分网站无法打开及登陆不了论坛等一些问题，有需要的网友可以尝试修改。利用Ping命令也可以测试出最佳MTU值的，此中方法更为简便，适用各类PPPoE 拨号上网ADSL;FTTH均可。 继续阅读 →

HE的DNS被联通给墙了

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最近几天发现我用HE的DNS的网站在联通网络下都打不开，第一感觉就是被墙了。看来每个运营商的墙都不一样，过滤最少的应该还是电信，谷歌的一些域名移动网络根本打不开。

看来在国内，还是用电信的的网络好，哪怕贵点，也比无缘无故打不开网站比较好。。。