Networking

For those who does not track FreeBSD-CURRENT -current@, Andre Opperamann (andre@) has just posted a new progress for his TCP/IP optimization:

今天Qing LI在-developers邮件列表中介绍了他和神明达哉(Tatuya Jinmei)、Keiichi Shima两位KAME重量级人物共同撰写的关于KAME实现的书。从出版社的介绍来看，这本书将于11月正式发布。[更正：作者说，此书应在10月而非11月发布]

It seems that my box loses its uptime record after I have migrated it to the Yizhuang IDC. The two things are related, but technically speaking, they are not. Actually I have discovered gokeeper’s hosts losed their uptimes as well, but I did not know why before. Sometimes I thought that was because the Linksys switch we have used, but there are some evidence that it is not; also I have at a point doubted the Cisco devices were misconfigured or have some firewalling features, but that’s not the answell, either.

用的linksys的交换机，似乎没有启用任何防火墙功能。从网络流量上看，也没有很明显的规格化迹象。公司的Cisco交换机就没事，而且同网段的其他机器也没事，不理解。。。改天tcpdump一下。

注：这篇文章属于作弊条性质，本人不负责其内容所依据理论之正确性。

a. 路由器重置方法：断电，用笔按住背面的RESET按钮，并接上电源，直至路由器提示灯都变成正常的样子为止。
b. 路由器默认IP为192.168.1.1，用户名和口令均为admin。

OpenBSD实现了与FreeBSD不同的timeout功能。今天hack CARP的时候用到了，留个记号。

New Callout and Timer Facilities for NetBSD

无语。谁能帮忙联系一下有关部门？

I have imported the latest OpenBSD netcat (a.k.a. nc(1), a very handy debugging utility) implementation to FreeBSD -CURRENT and the current plan is to MFC the stuff after one month’s settle.

From liukang.com:

今天拿到了传说中的IPv6地址段：2001:DA8:216::/48

有人在有人问是不是要实现类似FreeBSD的ZERO_COPY_SOCKET的时候怒啦，说啦：“I claim that Mach people (and apparently FreeBSD) are incompetent idiots. Playing games with VM is bad. memory copies are also bad, but quite frankly, memory copies often have less downside than VM games, and bigger caches will only continue to drive that point home.”

可是：
a) ZERO_COPY_SOCKET 并非默认启用的功能。
b) FreeBSD在7年前就实现了这个功能，某些系统至今连这个选项都没有。
c) FreeBSD的zero_copy manpage明示了其性能影响。