On Sun, 30 Oct 2016 12:25:50 +0100, Matthias Peter Walther said: > root@des1 ~ # ip rule > 0: from all lookup local > 32765: from all iif lo lookup ffnet suppress_prefixlength 0 > 32766: from all lookup main > 32767: from all lookup default > (ffnet is table 42) > root@des1 ~ # ip r s > default via 5.9.86.151 dev eth0 > 5.9.86.151 dev eth0 proto kernel scope link src 5.9.86.144 > root@des1 ~ # ip r s t 42 > blackhole default > Let's say I want to ping 8.8.8.8. What I expect is, that the package is > put into routing table 42 by the ip rule 32765. As there is no more > specific route for 8.8.8.8 than the default route in table 42, I expect > the suppress_prefixlength 0 option to put it back to the default routing > table and then to be send out through eth0. Note your table 42 is a blackhole. I suspect that using 'suppress_prefixlength 0' is acting differently than you expect - you've told it to use table 42 which has only a blackhole, and when it suppresses that route, there is no *other* route in table 42 to select - leaving you with a 'no route' situation. I don't think it's supposed to make the 'lookup ffnet' part go away, only entries *IN* that table that are longer than specified (which for 0 means "all of them").
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