Date: Wed, 10 Dec 2003 20:00:10 -0500 From: Don Bowman <don@sandvine.com> To: 'Andrea Venturoli' <ml.ventu@flashnet.it>, freebsd-net@freebsd.org Subject: RE: Two ISP connections Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337035E411F@mail.sandvine.com>
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From: Andrea Venturoli [mailto:ml.ventu@flashnet.it] > ** Reply to note from Barney Wolff <barney@databus.com> Wed, > 10 Dec 2003 11:39:00 -0500 > > > > I don't know of anything published that does this, but it's easy to > > write a perl or shell script that pings the router at the adsl isp > > and does the necessary things when it disappears and reappears. > > Mmh, only problem is one of the ISP is famous for blocking > ICMP as a whole, so no pings work. I haven't tried this > particular line yet, but I may need to use come other protocol. > > see the lft port (layer 4 traceroute) http://www.mainnerve.com/lft/ you can use this to get an ICMP response (albeit not echo) from your isp this way. [you can't really block icmp would fragment, it would break PMTU]. --don
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