Berkeley CSUA MOTD:Entry 54371
Berkeley CSUA MOTD
2018/10/15 [General] UID:1000 Activity:popular

2012/4/26-6/4 [Computer/Networking] UID:54371 Activity:nil
4/26    I see that soda has an ipv6 address but ipv6 traffic from this box
        doesn't actually work (ping6 <DEAD><DEAD>, ping6
        Is this expected to work?
        \_ Soda doesn't have a real IPv6 address.  The IPv6 addresses you see
           in ifconfig are just link-local addresses; any IPv6-capable machine
           will autogenerate these, whether or not it's connected to an IPv6
           will autogenerate those, whether or not it's connected to an IPv6
           router.  They're useful when you do things like connect two machines
           directly with an ethernet cable: they'll both assign themselves
           addresses and it just works.  You need a real address to talk to the
           directly with an ethernet cable: each machine will assign itself an
           address and it just works.  You need a real address to talk to the
           internet, though.
2018/10/15 [General] UID:1000 Activity:popular

You may also be interested in these entries...
2007/8/9-13 [Computer/Networking] UID:47570 Activity:low
8/9     Is there an automated way to change the IP of an XP machine? I have
        tests that need to get run on two separate sub-nets that now require
        me to physically go in and change the IP address of the test box.
        Cygwin is also installed if that helps any. Thanks
        \_ There are a few sort of hackey ways to do it:
           1) automate the mouse clicks and key strokes witto do it:
2007/4/19-21 [Computer/Networking] UID:46375 Activity:nil
4/19    After installing Logitech wireless mouse, my friend cannot connect from
        his PC to his wireless broadband router via a USB wireless network
        device.  It said that it cannot obtain IP address from the router.  Even
        uninstalling the Logitech wireless mouse doesn't help.  Do you know how
        to fix the wireless LAN problem, so that his PC can obtain IP address
2006/3/25-27 [Computer/Networking] UID:42433 Activity:nil
3/24    I want to write in my DSL router to allow incoming connection
        from certain IP range. How do I find out the IP range for SBC
        DSL say in Bay Area/SF?
2006/2/18-23 [Computer/Networking] UID:41923 Activity:low
2/18    My DSL modem's ip address is, my internal network
        behind my router is 10.0.0.x. Is there a way I can configure
        the router so I can access the DSL modem from my 10.0.0.x
        network directly without re-wiring? Static routes? I tried it
        but no much luck. I also tried changing my internal network to
        192.168.0.x, but still does not work. Thanks.
2006/1/28-31 [Computer/Networking] UID:41585 Activity:low
1/28    Just switched to Comcast from SBC and generally happy with it.  But
        can someone please explain to me why they are constantly pumping
        ARP traffic through the network?  It seems harmless, but I'm curious
        as I didn't see it with DSL.  It's a little disconcerting to see
        constant traffic on your router, even if ARPs are harmless from
        a bandwidth perspective, and it makes the WAN send/receive light
2006/1/22-24 [Computer/Networking] UID:41477 Activity:nil
1/21    I am trying to setup a small network for my girlfriend's
        mom's company.  They just bought an accounting package
        which requires windows 2003 server.  And they want internet
        access from each computer.  How should the network be setuped?
        Would it be dumb to use static IP for each computer and a
        computer as internet gateway?
2005/8/29-30 [Computer/Networking] UID:39329 Activity:moderate 54%like:37400
8/29    What's the difference between a hub, a switch and a router?  Thx.
        \_ AFAIK, probably be corrected by someone:
           hub: Allows communication on a LAN with bandwith shared amongs all
                the nodes on the hub and maxing out at the max line speed.
           switch: Allows communication on a LAN with bandwith greater than
                the max line speed (point to point)
2005/6/2-3 [Computer/Networking] UID:37941 Activity:moderate
6/2     I've been to many places and almost every place I go to have
        802.11b/g. However, almost all of them have protected access,
        which I presume they use because they don't want people stealing
        their bandwidth. So here is one idea I think will really
        revolutionize 802.11X... an option in the router that allows you to
        specify the percentage of unprotected bandwidth you are willing to
2005/2/25-27 [Computer/Networking] UID:36421 Activity:moderate
2/25    What is the smallest (physical and price) cisco router that can
        handle BGP?  It should be able to have more than 256 ram.
        \_ When you say ``handle BGP'', do you mean supports the bgp
           protocol or supports enough ram to keep a reasonable (what do you
           consider to be reasonable) number of routes in memory?  Do you want
           to be peering at PAIX, or do you just need a router to run the T1
2005/1/13-14 [Computer/Networking] UID:35697 Activity:high
1/13    I need help fixing someone's Win2K box.  Setup:  Win2K box -> D-Link
        router -> DSL modem.  The Win2K box cannot obtain a DHCP address
        (other computers can).  So, I assign a static IP, and set the default
        gateway and DNS server to be the D-Link router.  After this, the Win2K
        box can access web pages on the Internet as long as you specify the
        web site IP address directly -- but DNS doesn't work.  Computer used
2005/1/10-11 [Computer/SW/OS/VM] UID:35635 Activity:kinda low
1/10    VMware question for VMware gurus only. I've installed a WinXPsp1
        on top of WinXPsp2. How do you do the followings:
        1) transfer data between the two machines? I've tried mounting
           raw partition from WinXPsp1 but when I disable write, it
           doesn't boot up anymore (WinXP insists on writing)
        2) communicate between the two machines? I can ping WinXPsp1
2005/1/3-5 [Computer/Networking] UID:35531 Activity:kinda low
1/3     So I installed Debian (Sarge) on a home server for various reasons
        (including learning about Apache 2) and have a question:  how do I get
        all the useful information about my machine that I get in Windows with
        ipconfig /all?  And how do I turn DHCP on or off?  Set the host
        \_ ifconfig, man ifconfig for full details. ifup/ifdown to
Cache (1480 bytes)
link) or a point-to-point connection that a host is connected to. Routers do not forward packets with link-local addresses. Link-local addresses may be assigned manually by an administrator or by operating system procedures. Most often they are assigned using stateless address autoconfiguration. such as configuring link-local addresses as well as globally routable addresses on the same host. Therefore, hosts search for a DHCP server on the network, before assigning link-local addresses. Address Resolution Protocol (ARP) probes to ascertain that the address is not in use on the network. If a reply is received to the ARP, it indicates the candidate IP address is already in use; a new random candidate IP address is then created and the process repeated. The process ends when there is no reply to the ARP, indicating the candidate IP address is available. Link-local IPv6 address assignment automatically implies the on-link presence for this routing prefix, unlike for the addresses of other scopes. IPv6 introduced additional means of assigning addresses to host interfaces. Through NDP routing prefix advertisements, a router or a dedicated server host may announce configuration information to all link-attached interfaces which causes additional IP address assignment on the receiving interfaces for local or global routing purposes. This process is sometimes also considered stateless, as the prefix server does not receive or log any individual assignments to hosts.