As far as the 2.6 kernel is concerned, the max table is 0xFFFFFFFF (from rtnetlink.h). However, iproute2 uses a signed integer in it’s filter to do the lookup so at 2^31 it thinks you specified an invalid table and defaults to showing you table 255.
There is no need to set the broadcast address manually, it is determined automatically from the IP network and subnet mask.
I found an answer. Sure, you cannot do it from within the netns. But, if you execute ip netns exec …. from within the root network namespace, it all works. ip netns exec <PID> ip link set eth10 netns 1 Then it works! It takes the PID (1 in this case) to which we are … Read more
I think the ip tool just doesn’t print the NTF_PROXY flag. In ip/ipneigh.c, after the NTF_ROUTER block, try adding if (r->ndm_flags & NTF_PROXY) { fprintf(fp, ” proxy”); } I don’t have an NDP proxy installation, so I can’t test it. From reading the kernel sources, however, it appears that the entries will all get returned … Read more
The routes metric is to set preference among routes with equal specificity. That is true of routing in general (i.e. Cisco, Windows, etc). So the model works like: Find the most specific route (aka the longest prefix match*) If there are multiple routes with the same specificity, pick the one with the lowest administrative distance … Read more
There exists a way to list all routing entries of all tables. ip route show table all Using some shell piping magic, you can extract all table names and IDs like this: ip route show table all | grep “table” | sed ‘s/.*\(table.*\)/\1/g’ | awk ‘{print $2}’ | sort | uniq or ip route show … Read more
When adding a route to a multihomed host, you might want to have control over the source IP address your host is sending from when starting communications using this route. This is what src is for. A short example: you have a host with two interfaces and the IP addresses 192.168.1.123/24 and 10.45.22.12/24. You are … Read more
In linux, IP addresses have a notion of ‘primary’ and ‘secondary’ addresses. The primary is typically the first address you add to the system. Removing the primary address has the implicit operation of flushing the entire list of secondary addresses also. You can avoid this behaviour by setting the sysctl net.ipv4.conf.all.promote_secondaries to 1 like so: … Read more
The official statement regarding the plans to obsolete net-tools was made on the debian-devel mailing list in early 2009 by one of the net-tools maintainers. True to their statement, net-tools has been hardly maintained at all since that time. Luk Claes and me, as the current maintainers of net-tools, we’ve been thinking about it’s future. … Read more
Quoting Thomas Pircher‘s website (cc-by-sa): ifconfig vs ip The command /bin/ip has been around for some time now. But people continue using the older command /sbin/ifconfig. Let’s be clear: ifconfig will not quickly go away, but its newer version, ip, is more powerful and will eventually replace it. The man page of ip may look … Read more