Very Computer

by **firewall_f..** » Thu, 03 Jun 1999 04:00:00

eth1 to nothing at the moment, but soon to a DSL router.

When I use nmap (from another Linux box) to scan 192.168.0.201, the
interface goes dead. I can still ping it from the box itself, but it
cannot ping other PC's, and other PC's can no longer ping it. If I use
UserNet to restart eth0, it works again until I hit it with nmap. I'm
using nmap 2.2beta4-1 with the included GUI to perform the scan.
Settings are the startup defaults, SYN Stealth, TCP & ICMP, OS
Detection (nmap -sT -O 192.168.0.201)

Am I inadvertantly executing a DOS attack on my own server?

Help please..

Also, thanks to those responding to my earlier firewall/masquerading
post.

FF

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by **firewall_f..** » Thu, 03 Jun 1999 04:00:00

A little something to add - even if I don't scan with nmap, the
interface will still die after a period of time. about 10 seconds, in
fact when using tcpdump. Restart it (ipconfig eth0 down, ipconfig eth0
up) and all is well again. It seems to last longer if I don't use it
for anything. As soon as I run tcpdump to listen for traffic, it dies
in < 10 S, no errors, just quits.

FF

> eth1 to nothing at the moment, but soon to a DSL router.

> When I use nmap (from another Linux box) to scan 192.168.0.201, the
> interface goes dead. I can still ping it from the box itself, but it
> cannot ping other PC's, and other PC's can no longer ping it. If I use
> UserNet to restart eth0, it works again until I hit it with nmap. I'm
> using nmap 2.2beta4-1 with the included GUI to perform the scan.
> Settings are the startup defaults, SYN Stealth, TCP & ICMP, OS
> Detection (nmap -sT -O 192.168.0.201)

> Am I inadvertantly executing a DOS attack on my own server?

> Help please..

> Also, thanks to those responding to my earlier firewall/masquerading
> post.

> FF

> Sent via Deja.com http://www.deja.com/
> Share what you know. Learn what you don't.

Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.

by **firewall_f..** » Thu, 03 Jun 1999 04:00:00

Bad 3c509 adapter - sorry for the false alarm. Replaced it, all works
fine.

FF

> eth1 to nothing at the moment, but soon to a DSL router.

> When I use nmap (from another Linux box) to scan 192.168.0.201, the
> interface goes dead. I can still ping it from the box itself, but it
> cannot ping other PC's, and other PC's can no longer ping it. If I use
> UserNet to restart eth0, it works again until I hit it with nmap. I'm
> using nmap 2.2beta4-1 with the included GUI to perform the scan.
> Settings are the startup defaults, SYN Stealth, TCP & ICMP, OS
> Detection (nmap -sT -O 192.168.0.201)

> Am I inadvertantly executing a DOS attack on my own server?

> Help please..

> Also, thanks to those responding to my earlier firewall/masquerading
> post.

> FF

> Sent via Deja.com http://www.deja.com/
> Share what you know. Learn what you don't.

Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.

Very Computer

nmap kills my interface!

nmap kills my interface!

nmap kills my interface!

nmap kills my interface!