Please help: Wierd traceroute's and pings

Please help: Wierd traceroute's and pings

Post by Dave Hamilto » Sun, 20 Jun 1999 04:00:00

Ok... I'm at a loss... and something's NOT right.  I'm running RedHat
6.0 with the "RedHat Approved" kernel 2.2.5-22 on a dual Pentium 100
Dell machine with 48MB of RAM.  I have two 3C509 ethernet cards in the
machine, one connected to a cable modem using the modified dhcpcd
client for RoadRunner, and the other assigned a static "IANA-reserved"
address connected to my home network.  I have set up ipchains to
perform masquerading tasks and it all seems to work just fine.
However, when I traceroute or ping from the linux machine DIRECTLY, I
get VERY strange results, i.e:

PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=243 time=-969.-8 ms
64 bytes from icmp_seq=1 ttl=243 time=68.8 ms
64 bytes from icmp_seq=2 ttl=243 time=63.8 ms
64 bytes from icmp_seq=3 ttl=243 time=41978.7 ms
64 bytes from icmp_seq=4 ttl=243 time=69.6 ms
64 bytes from icmp_seq=5 ttl=243 time=67.9 ms
64 bytes from icmp_seq=6 ttl=243 time=69.2 ms
64 bytes from icmp_seq=7 ttl=243 time=72.0 ms
64 bytes from icmp_seq=8 ttl=243 time=67.5 ms
64 bytes from icmp_seq=9 ttl=243 time=78.4 ms
64 bytes from icmp_seq=10 ttl=243 time=69.5 ms
64 bytes from icmp_seq=11 ttl=243 time=41984.6 ms

--- ping statistics ---
12 packets transmitted, 12 packets received, 0% packet loss
round-trip min/avg/max = -969.-8/6968.3/41984.6 ms

Very strange.  This happens whether I've loaded my ipchains rules or
not, so I don't think it has to do with them.  The strange thing, of
course, is that when I do the same ping from my Mac or Windows machines
inside the network, they work FINE and give "normal" results to
traceroutes and pings.

Any thoughts?

Please help!



1. pppd is up, but cannot ping/traceroute/connect to internet - help please

I am pretty new to linux but everything worked fine with my connection
since installation 6 months ago until yesterday.....
Now when I use kppp the modem connects with the ISP with no problem
but after that, none of the browsers will get to any site.
a. I have tried ping and no packet was returned
b. I have tried traceroute and it says it cannot send

I am really new to networking so maybe I have done a silly thing and
now cannot see what it is........
I would really appreciate any help on how to fix it.

Thanks in advance

This is the output of ifconfig:
lo        Link encap:Local Loopback  

          inet addr:  Mask:

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:32 errors:0 dropped:0 overruns:0 frame:0

          TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2852 (2.7 Kb)  TX bytes:2852 (2.7 Kb)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:  P-t-P:
          RX packets:4 errors:2 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:70 (70.0 b)  TX bytes:87 (87.0 b)
This is the ouput of route

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref  
Use Iface  *      UH    0      0      
0 ppp0       *            U     0      0      
0 lo
default         UG    0      0      
0 ppp0

2. Netra T1 console

3. ping,traceroute,dns work; telnet,ftp don't - help (LNE100TX, tulip 0.9.13

4. Matrox Mga Millenium

5. Turning 'ping' off, please help.

6. Dip problemo..Help..

7. Can't ping and slow traceroute through ipfw

8. Has ANYONE Gotten 16-bit Color Depth with STB Lightspeed VL?

9. traceroute OK, can't ping?

10. Name Server on Solaris 7 can't be used by sendmail,ping and traceroute

11. Ping works, traceroute doesn't

12. Traceroute works, ping doesn't....

13. Ping don't work - but traceroute does