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Northern Europe braces for gale-force winds and extensive floods_我的网站

一 | 无聊，研究了IPv6运营商的当前分布机制，发现了一个小问题。目前，ISP在给我们分配ipv6时，同时给两个不同网段分配ipv6地址。第一个是唯一的地址，即广域网端口地址。此地址是唯一的，不会用于下行链路分配。    LONDON -- Hundreds of people were being evacuated from their homes and schools closed in parts of Scotland on Thursday, as much of northern Europe braced for stormy weather, heavy rain and gale-force winds from the east.The U.K.'s weather forecaster, the Met Office, issued a rare red alert — the highest level of weather warning — for parts of Scotland, predicting “exceptional rainfall” Thursday and Friday that is expected to cause extensive flooding and “danger to life from fast-flowing or deep floodwater.” The last red alert in the U.K. was issued in 2020.Forecasters say the storm, named Babet by U.K. officials, could bring more than a month’s worth of rain in the worst-affected regions in Scotland.Babet already brought flooding to several towns and villages in Ireland, with some areas remaining under water and without power Thursday. Soldiers helped with evacuation measures in the town of Midleton in County Cork, where more than 100 properties were flooded.In the town of Brechin, near Scotland's eastern coast, officials told residents of about 400 houses to evacuate to local rest centers. Local schools were closed and will remain shut on Friday.In Denmark, residents scrambled to place sandbags along exposed areas. In Assens on the central island of Funen, emergency services deployed huge rubber tubes in the harbor to counter rising water levels, broadcaster TV2 reported. Southern Denmark police urged people along the east coast to leave exposed areas if the weather predictions remain, saying cottages, harbors and other places could be flooded.TV2 reported that the region would likely see the worst flooding in 110 years, and the Danish Meteorological Institute said waves could reach 4 meters (13 feet) along east-facing coasts. The southeastern Danish town of Koege wrote on its Facebook page that emergency workers were busy filling sandbags and urged citizens to “avoid unnecessary baths, dishes, laundry and other water-intensive activities,” saying “the municipality’s treatment plant was at risk of being overloaded.”Police in the area warned that roads may be blocked, urged people to secure valuables and advised against sleeping on their boats in the harbors, saying that "if something happens, emergency services cannot get to them,” police spokesperson Brian Bang-Rasmussen said.Copenhagen's airport and the Danish national rail company warned of cancellations and delays Friday because of bad weather. Several ferry lines between Danish islands were suspended, as were ferries to Rostock in northern Germany and to Oslo.Swedish meteorologists also issued a warning for the south coast from Friday evening and Saturday. They said that the water level in southern parts of Sweden may reach its highest level since the 1990s.In Germany, authorities warned of high water in bays in Schleswig-Holstein, south of the Denmark border, until mid-Saturday.Authorities also warned of high water in the next two days on the Baltic Sea coast of Schleswig-Holstein, Germany’s northernmost state, with water levels of up to 2 meters (6.6 feet) above average possible in the inlet where the city of Flensburg is located. Some ferries to the North Sea islands of Foehr and Amrum were delayed or canceled, German news agency dpa reported.Norwegian meteorologists said a strong low-pressure area over Great Britain combined with high pressure over northern Scandinavia was creating strong east-northeasterly winds, with ”very strong gusts" expected to hit southern Norway from the east.___Olsen reported from Copenhagen, Denmark.___This story corrects that the town of Koege is in southeastern, not southwestern, Denmark.。第二个是前缀地址，它也是网关地址，用于将IPv6地址分配给其余设备。根据IPv6分配规则，前缀地址必须在/60位之内。

二 | 目前，中国的运营商有两个前缀，一个是56，另一个是60。电信大部分是56台，联通移动大部分是60台。当然，这个长度不好也不坏，不管是56还是60，你得到的剩余地址量是无穷的，即使你家里的每一个灰尘都被分配到了公网IP上。问题是，操作员只会为您分配一次前缀地址。当路由器获得前缀地址时，其余设备将通过前缀地址向下分配剩余地址。

三 | 例如，当您通过PPPoE拨号时，您将获得广域网端口的IP地址。此机制与ipv4:240e:9c:2a04:c8ad:bdd8:af0b:843b:f60/64相同。然后可以得到前缀IP地址：240E:9C:2CD3:8D00:：1/56。当您的手机连接到WiFi时，路由器将根据此前缀地址为您的手机分配剩余地址，例如240E:9:C:2CD3:8D00:XXXXXX:XXXXXX:XXXXXX:XXXXXX:XXXXXX如果您在家中只使用一个路由器，这样您的网络就不会出现问题，您的设备将通过此路由器在前缀下分配IPv6地址。

四 | 问题是，如果您有二级路由器、三级路由器或更多。如前所述，运营商只会为您的网络分配一个前缀地址，也就是说，当您家中有二级或更多路由器时。无法通过连接到辅助路由器的设备访问IPv6地址。

五 | 由于辅助路由器只能获取由主路由分配的IPv6地址，并且无法获取前缀地址，因此无法将地址分配给连接到辅助路由的设备。所以，家庭的朋友们，如果你的家庭是这样的，你需要注意它。当然，还有解决办法。首先，将二级路由器替换为交换模式，使主路由成为唯一的路由器，所有地址都通过主路由器分配。不要怪自己画得不好。其次，如果您确实需要两层或更多层路由器，则只能将非主路由器设置为IPv6穿透模式（passthrough），这相当于主路由器的IPv6分配，以完全工作，即仅适用于IPv6的IPv6交换机。

六 | 这两种拓扑相当于交换机，但区别在于：第一种是纯IPv4/IPv6都使用单层网络拓扑。

七 | 二是IPv4采用多层网络拓扑，IPv6采用单层网络拓扑。需要，取决于他们自己的需要。

八 | 最后指出，许多朋友的路由器不支持IPv6，因此无法获得IPv6地址。如果您的运营商已被分配并且Lightcat支持IPv6，请尝试此解决方案：如果使用此解决方案，则Lightcat必须具有强大的性能，否则将出现不稳定。因此，在经济条件允许的情况下，建议购买支持IPv6协议的路由器。

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