[j-nsp] Strange MPLS behaviour

[Alexander Arsenyev (GU/ETL)]

Hello Jonas,

I see Your point. However, fxp0 is just one of router interfaces and is perfectly eligible of being selected as "primary", see http://www.juniper.net/techpubs/software/junos/junos64/swconfig64-interfaces/html/interfaces-family-config11.html#1014302 and http://www.juniper.net/techpubs/software/junos/junos64/swconfig64-interfaces/html/interfaces-family-config12.html#1014326 . However, my tests show me that "primary" does not work for locally generated MPLS PING (UDP dport 3503) traffic - see my email below.

HTH,
Cheers
Alex


-----Original Message-----
From: Jonas Frey [mailto:jf at probe-networks.de]
Sent: 22 December 2004 06:20
To: Alexander Arsenyev (GU/ETL)
Cc: juniper-nsp at puck.nether.net
Subject: RE: [j-nsp] Strange MPLS behaviour


Hello Alex,

thats exactly what i observed, we were only using 127/8 ip addresses on
lo0 before. To fix all this we added "real" ip addresses to lo0 and now
things work. However i dont think its a good idea to send out packets
sourced from fxp0 anyway.

Running 6.4R2.4 here.

Regards,
Jonas

On Wed, 2004-12-22 at 01:17, Alexander Arsenyev (GU/ETL) wrote:
> Hello,
> 
> It is indeed very interesting scenario.
> 
> I actually labbed this up and source IP address of locally generated ping packets depends on:
> a) whether lo0.0 has a valid (non-127/8) IP address assigned
> (if not then fxp0.0 IP address is used as source IP)
> b) whether ICMP ping or MPLS PING (UDP dport 3503) is used
> (MPLS PING packets use lo0.0 or fxp0.0 IP address as source IP,
> while ICMP ping packets use lo0.0 or outgoing interface' IP address as source IP)
> c) whether "default-address-selection" is configured
> (if configured then lo0.0 IP address is used as source IP)
> I used JUNOS 5.6 in my tests, what is Your JUNOS version?
> HTH,
> Cheers
> Alex
> 
> 
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net]
> Sent: 21 December 2004 08:32
> To: sthaug at nethelp.no
> Cc: juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] Strange MPLS behaviour
> 
> 
> 
> > set system default-address-selection
> > 
> > Steinar Haug, Nethelp consulting, sthaug at nethelp.no
> 
> Thats a good idea but if i do not want/cant use that option, i'd like to
> have the router actually use the ip address on the interface the lsp is
> running on. Also i have to/from statements in the lsp config so i dont
> understand why the router still uses completly different (fxp0)
> addresses. This doesnt make sense.
> 
> Regards,
> Jonas
> 
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