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一 | Major housing industry groups voiced "profound concern" in a letter this week urging the Federal Reserve to stop raising interest rates.The rare public admonishment from top business advocates -- including the National Association of Realtors and the National Association of Home Builders -- underscores a dramatic slowdown in the housing market due in large part to rising interest rates.The letter arrives roughly three weeks before the Fed plans to make its latest rate-hike decision.Mortgage rates have reached their highest level in more than two decades and they have continued to rise. Data released on Thursday showed that mortgage rates increased for the fifth consecutive week, according to Freddie Mac."The speed and magnitude of these [mortgage] rate increases, and resulting dislocation in our industry, is painful and unprecedented," the letter from the housing groups said.Here's what to know about why real estate groups called on the Fed to stop raising rates:

What's happening in the housing market?

Sky-high mortgage rates have dramatically slowed the housing market, since homebuyers have balked at stiff borrowing costs and home sellers have opted to stay on mortgages that lock them into relatively low rates.Mortgage applications have fallen to their lowest level since 1996, the Mortgage Brokers Association said earlier this month.Sales of previously owned homes, meanwhile, have plummeted more than 15% compared to a year ago, the National Association of Realtors found in August.The slowdown has coincided with a sharp rise in costs for potential homebuyers.The average interest rate for a 30-year fixed mortgage has climbed to nearly 7.6%, Freddie Mac data shows.When the Fed initiated the rise of bond yields with its first rate hike of the current series in March 2022, the average 30-year fixed mortgage stood at just 4.45%.Each percentage point increase in a mortgage rate can add thousands or tens of thousands in additional costs each year, depending on the price of the house, according to Rocket Mortgage.

What role is the Federal Reserve playing in the housing market slowdown?

An aggressive series of interest rate hikes at the Federal Reserve since last year has pushed up the 10-year Treasury yield, which loosely tracks with long-term mortgage rates.The Fed has fought elevated inflation with borrowing cost increases as it tries to slash price hikes by slowing the economy and choking off demand.While inflation has fallen significantly from a peak of about 9% last summer, price increases remain more than a percentage point higher than the Fed's inflation target.Price increases held steady in September, fresh data on Thursday showed, suggesting that elevated inflation remains resistant to the interest rate hikes.The persistence of elevated inflation has prompted the Fed to espouse a policy of holding interest rates at high levels for a prolonged period, which in turn has increased the 10-year Treasury yield and put upward pressure on mortgage rates.Moreover, the Fed expects to raise rates one more time this year, according to projections released last month.Speaking at a press conference in Washington, D.C., last month, Fed Chair Jerome Powell acknowledged the continued effect of interest rates on mortgages, noting that activity in the housing market "remains well below levels of a year ago, largely reflecting higher mortgage rates."

What do the housing industry groups want the Fed to do?

Housing industry advocates want the Fed to take swift actions that reassure investors and other market participants of an end to the policies cooling the industry.Most notably, the industry groups want the central bank to release a statement saying that it has abandoned consideration of additional rate hikes.In their letter to Fed officials, the housing groups cautioned that a further slowdown in real estate could help tip the U.S. economy into a recession, scuttling the central bank's effort to achieve a "soft landing.""We urge the Fed to take these simple steps to ensure that this sector does not precipitate the hard landing the Fed has tried so hard to avoid," the letter said.。无聊，研究了IPv6运营商的当前分布机制，发现了一个小问题。

二 | 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。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。

三 | 根据IPv6分配规则，前缀地址必须在/60位之内。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。

四 | 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。

五 | 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。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。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。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。