Berkeley CSUA MOTD:Entry 28524
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2025/07/08 [General] UID:1000 Activity:popular
7/8     

2003/5/22-23 [Computer/Networking] UID:28524 Activity:high
5/22    To people with TCP/IP clue: A friend of mine has a wireless router
        at home (D-Link's DI-614+, but there doesn't seem to be much in
        the way of useful model-specific docs around of any but the "here's
        how you click a button" kind). The thing comes with a built-in
        capability for firewalling, "virtual server" (i.e. port forwarding to
        a specific LAN machine, set up by port number on the external
        interface), etc. At the moment, we can't get traceroute (from local
        machines to the outside world) to work whatsoever; it shows the first
        hop to the router, and doesn't give anything past that. I've tried
        allowing all ICMP&UDP traffic in both directions, but to no avail.
        Presumably I don't understand the traceroute mechanism
        well enough, and am missing something. Any suggestions?
        \_ I had this problem with an SMC router. I have reported this to the
           manufacturer. Later, they have come up with a firmware that fixed
           this problem. Lots of those home broadband routers have very lousy
           TCP/IP implementations, so the problems like this are expected to
           pop up all the time.
           \_ That's, err, good to know I suppose. I'll try that route,
              thanks. -op (other advice still solicited though)
        \_ Not an expert, but I believe traceroute is simply a series of pings
           with a timeout short but increasing timeout-- so you ping http://yahoo.com,
           and router1 responds but router2 does not because the timeout has
           elapsed.  For the second ping, you increase the timeout so router2
           replies but not router3.  And so on.  Short answer is that your fw
           is most likely preventing the ICMP echo from getting back to your
           PC.
           \_ you're right...you're not an expert.
                \_ hello cranky asshole router guy!
                   \_ CARG does have a point, he indicated that ICMPs are
                   \_ CARG does have a point, op indicated that ICMPs are
                      allowed to pass through, which implies that he has more
                      clue than I thought he did.  I just didn't read his post
                      all the way through and gave him the handwavy traceroute
                      explanation that wasn't very helpful. -- nae
                        \_ it's also inaccurate; traceroute is not a series
                           of pings.  -CARG
                           \_ it is for some m$ implementations, i hear. -op
           \_ timeout or ttl (time to live) based on number of hops
           \_ That's just the micro$oft "tracert" implementation (or rather,
              a distorted account thereof); most others use UDP. But in any
              case, see below; this is probably not the problem. -op
        \_ The default setting on the router is probably to filter ICMP
           echos.
           \_ Yes, but I'm fairly certain I put in a firewall rule to allow
              all ICMP traffic in both directions. -op
        \_ In the Advanced->Filters menu, try setting ICMP type 11 to always
                                                      oops, 8 _/
           In the Advanced->Firewall menu, set to allow all ICMP types
           \_ WHOOPS. Upon noticing the ICMP option missing in the "Filters"
              dialog's "protocols" dropdown, I found out I'm several firmware
              updates behind. However, the latest firmware update, even though
              labelled "fixes traceroute issue" on D-Link's site, still
              has no ICMP option there and traceroute is still not working. -op
           \- hello has anyone seen the following "traceroute problem":
              on a couple of solaris boxes, all of a sudden something
              weird happens to the tcpstack and it never sends ICMP Port
              UnRchables back to you? So any udp traffic is silently
              absorbed if there is no application to fwd it to? ok tnx --psb
        \_ Look for your answer on http://broadbandreports.com.
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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