help on check_udp

[Subhendu Ghosh]

Depends on the app - if the app can accept and reply to plain text then 
check_udp -s send_string -e expect_string works

Otherwise have to fall back to application specific checks in most cases.
eg: dhcp will only accept packets originating on port 68 to port 67

check_snmp, check_dhcp in thes two cases.

-sg

On Fri, 8 Nov 2002, Neil wrote:

> Hi Subhendu, 
> 
> Thanks. So how are we suppose to monitor UDP ports? I also tried port 67, it 
> didn't work too. 
> 
> Subhendu Ghosh writes: 
> 
> > 
> > port - 161 - snmp apps do not reply to a packet they don't understand. 
> > 
> > -sg 
> > 
> > On Thu, 7 Nov 2002, Neil wrote: 
> > 
> >> It seems that check_udp doesn't work.  
> >> 
> >> I tried:  
> >> 
> >> ./check_udp -H 10.2.2.10 -p 161  
> >> 
> >> and I get:  
> >> 
> >> No data was recieved from host!
> >> No response from host on port 161  
> >> 
> >> I even tried adding the -s and -e option, but still, same output.  
> >> 
> >> Please advise.  
> >> 
> >> Thanks.  
> >> 
> >> Neil  
> >> 
> >> 
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