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Old 01-29-2003, 11:21 PM   #1
robeb
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Problem pinging default gateway


My ISP has me on a 10.0.0.0/24 IP block. I'm am trying to ping the default gateway:

ping -I eth0 -c 1 10.0.0.1

but when I try to ping it as root I get an error message:

ping: sendmsg: Operation not permitted

route -n shows my routing tables:

Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0 eth0 <--

ifconfig -a eth0 shows my configuration:

inet addr:10.0.0.112 Bcast:10.0.0.255 Mask:255.255.255.0

I guess I'm not sure why I can't ping my default gateway but I can browse the Internet and ping other hosts (like yahoo.com)
 
Old 01-29-2003, 11:24 PM   #2
Grim Reaper
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The gateway doesn't drop ICMP packets by any chance?

If your not sure, what distro are you running?
 
Old 01-29-2003, 11:33 PM   #3
robeb
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Red Hat 7.3 -- but wouldn't I would get a timeout message instead of an operation not permitted message if the gateway dropped packets?
 
Old 01-29-2003, 11:42 PM   #4
Grim Reaper
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yeah, but i thought that i remember reading in a guide somewhere that the host machine could send a message back similar to that one...i think it was: http://www.linuxsecurity.com/resourc...-tutorial.html

otherwise, i have no idea....your able to ping other machines using the same command, only with the different IP, correct?
 
Old 01-29-2003, 11:46 PM   #5
Darin
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Isn't that the message you'd get if a firewall (your gateway is most likely a firewall) was set to REJECT instead of DROP?
 
Old 01-29-2003, 11:57 PM   #6
robeb
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Yes, I can ping other hosts outside of my network (it doesn't appear that there are any other hosts on my network, which is really odd since I live in a complex with about 600 other apartments).

I believe I read the same part of the tutorial you were refering to. According to the tutorial, " The following reject types are currently valid: icmp-net-unreachable, icmp-host-unreachable, icmp-port-unreachable, icmp-proto-unreachable, icmp-net-prohibited and icmp-host-prohibited. The default error message is to send an port-unreachable to the host."

I get a "ping: sendmsg: Operation not permitted" but I suppose you could set it up to be a custom message, too.

Very strange how 2 different ISP policies differ. When I was with AT&T Broadband they didn't care what I pinged or scanned. Now I'm with Qwest and they have me on private 10.0.0.0/24 network and won't give me static IP because they no longer support them. BS IMHO.
 
Old 01-30-2003, 12:34 AM   #7
robeb
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Ok, now I'm really confused. I hooked up my labtop (Windows XP)directly to the modem and now I can ping the gateway. Hell, I can even telnet to it. Can anyone tell me why I wouldn't be able to do this from my router?
 
  


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