Hello,
This doesn't seem to be a major problem, but I just installed a Linksys befsr41 ver3 router, and installed a default route -gateway as 192.168.1.1.


This works well and I seem to be able to ping everything. The one thing I noticed was the inability to traceroute. I have a WinXP box in the other room (The linux box is 192.168.1.101 and WinXP is 192.168.1.100 ---> both static meaning DHCP is turned off in router...)
--anyway the winxp box can tracert etc.

Back to Linux: I have 3 entries in my route table. (The loopback, the 192.168.1.0 net and the default GW) . What am I missing? I would really like to be able to traceroute from my slackware box. Hmmmm?

Thanks ahead of time,


BC

The netmask?

Well since it is a class c address and not subnetted further I assumed it should be 255.255.255.0 ??
As I mentioned I am able to ping outside of network (to Internet) - I just can't get anything from a traceroute. On a tcpdump it appears that it is receiving something from the address (a UDP packet I think) when I am in the middle of running traceroute, but the actual traceroute just comes back with " * * * ".

-bc

I wanted to note that I also had the same problem with knoppix (live distro) on my p4. Everything worked great when I got it up and going with the right driver (3c940 gig/ethernet ).
But, when I routed it to the Internet, I would have web working, ftp etc etc, just NO TRACEROUTE. And again, WinXP can do the "tracert" under the same exact machine. I am thinking that maybe I am not routing correctly. Here is my routes on the slack machine:
(The routing table is the same on the knoppix boot):


bash-2.05b# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.1.1 0.0.0.0 UG 1 0 0 eth0
bash-2.05b# netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
localnet * 255.255.255.0 U 0 0 0 eth0
loopback * 255.0.0.0 U 0 0 0 lo
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0

AND HERE IS A PORTION OF "TCPDUMP" WHILE TRACEROUTING:

10:39:54.892988 shea101.homelinux.net.41249 > web1.linuxquestions.org.33436: udp 10 [ttl 1]
10:39:59.892287 shea101.homelinux.net.41249 > web1.linuxquestions.org.33437: udp 10 [ttl 1]
10:40:04.892300 shea101.homelinux.net.41249 > web1.linuxquestions.org.33438: udp 10
10:40:09.891778 shea101.homelinux.net.41249 > web1.linuxquestions.org.33439: udp 10



Well, it looks to me that it's right, but maybe I need one more route? I dunno.... I guess that is why I am here...

-bc

I was having the same problem you were and I ran across your post while I was doing a search on google. I found out that windows uses icmp datagrams for traceroute. Linux traceroute runs using udp datagrams by default. As I didn't have my router configured to forward those udp ports to the system I was using to originate the traceroute I wasn't getting a response. If you look at the man page for traceroute you will see that you can change the traceroute to use icmp with -I. Ex : traceroute -I google.com

Right on- I appreciate the input. I was wondering why it wasn't responding. I knew it had something to do with port/packet forwarding as it worked under windows but not linux.. (One of the few things that is reversed HA) Guess once again rtfm and I should pay more attn to man pages. Strange, because I always thought traceroute was a icmp based application. Oh well... thanks!


-bc

np. everyone else in the netops department at my work thought that linux used imcp for traceroutes, as do the majority of the websites that I found when I was looking for an explanation. Finally found one post where someone mentioned that linux traceroutes use udp by default. Looked at the man page, beat my head against the wall a few times, replied to your post, and reveled in the fact that I've finally purged redmond's blight from every system I own.

right on. Could a conflict like this cause a problem between windows and linux like martygehre's:
http://www.linuxquestions.org/questi...d.php?t=100532
do you guys know what the deal is?