ping question

[Loren M. Lang]

On Mon, Feb 14, 2005 at 11:21:03AM -0800, ann kok wrote:
> Hi all
> 
> Thank you very much for your help
> 
> The freebsd router is behind the cisco router.
> 
> Do you have any experience to determine the traffic is
> in freebsd and cisco from outside?
> 
> Can traceroute give figure to prove it?

I'm not quite sure if I understand what you're asking, but if you want
to see what traffic is going into/out of/through them, tcpdump is a good
command-line based packet sniffer and ethereal is it's gui cousin.  You
can even use tcpdump to capture data and later view it on a different
computer with ethereal.  iptraf will show you general usage of the
traffic crossing your router.  If your asking to see what path the
traffic is taking from point A to point B, then traceroute is your best
friend.

> 
> Please help
> 
> Thank you again
> 
> --- "Loren M. Lang" <lorenl at alzatex.com> wrote:
> 
> > On Sat, Feb 12, 2005 at 08:50:32AM -0800, ann kok
> > wrote:
> > > Hi all
> > > 
> > > I ping from redhat to cisco router and freebsd
> > router
> > > but I don't understand ttl (time to live)
> > > 
> > > Cisco router has ttl=251 and freebsd router has 58
> > > Does it set by the router itself?
> > > Can I change it in freebsd?
> > 
> > FreeBSD's default ttl, I believe, is 64, Cisco's is
> > probably 255.  As
> > long as the number of hops neccessary to get to a
> > certain computer is
> > never more than 64, there's nothing wrong with it. 
> > The highest I've
> > seen is about 30 and the Internet is going to have
> > to grow a bit, I
> > think, before it's an issue.
> > 
> > > 
> > > Thank you
> > > 
> > > 64 bytes from 212.223.x.193: icmp_seq=1151 ttl=251
> > > time=100 ms
> > > 64 bytes from 212.223.x.193: icmp_seq=1152 ttl=251
> > > time=103 ms
> > > 64 bytes from 212.223.x.193: icmp_seq=1153 ttl=251
> > > time=104 ms
> > > 64 bytes from 212.223.x.193: icmp_seq=1154 ttl=251
> > > time=106 ms
> > > 
> > > 64 bytes from 212.x.254.4: icmp_seq=1182 ttl=58
> > > time=105 ms
> > > 64 bytes from 212.x.254.4: icmp_seq=1183 ttl=58
> > > time=105 ms
> > > 64 bytes from 212.x.254.4: icmp_seq=1184 ttl=58
> > > time=104 ms
> > > 64 bytes from 212.x.254.4: icmp_seq=1185 ttl=58
> > > time=108 ms
> > > 
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-- 
I sense much NT in you.
NT leads to Bluescreen.
Bluescreen leads to downtime.
Downtime leads to suffering.
NT is the path to the darkside.
Powerful Unix is.

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Fingerprint: B3B9 D669 69C9 09EC 1BCD  835A FAF3 7A46 E4A3 280C