On 6/7/22, Tim Woodall <debianu...@woodall.me.uk> wrote: > On Tue, 7 Jun 2022, Greg Wooledge wrote: > >> On Tue, Jun 07, 2022 at 11:22:34AM -0400, Dan Ritter wrote: >>> >>> search Search list for host-name lookup. By default, the >>> search >>> [...] >>> This may be changed by listing the desired domain search >>> path following the search keyword with spaces or tabs separating the >>> names. Resolver queries having fewer than ndots dots (default is >>> 1) in them will be attempted using each component of the search path in >>> turn until a match is found. >> >> I've read this paragraph a few times, and as far as I can tell, it's >> simply wrong. >> > Seems right to me: > > $ cat /etc/resolv.conf > search home.woodall.me.uk > options ndots:3 > nameserver 2001:8b0:bfcd:100:216:3eff:fee0:7102 > nameserver 2001:8b0:bfcd:8100:216:3eff:fee1:7102 > > $ host ipv4.wlan.dirac > ipv4.wlan.dirac.home.woodall.me.uk has address 192.168.3.16 > ipv4.wlan.dirac.home.woodall.me.uk has address 192.168.4.16 > > Change that 3 to a 2 and: > > $ host ipv4.wlan.dirac > Host ipv4.wlan.dirac not found: 3(NXDOMAIN) > > >> If you go down farther in the page and look at: >> >> ndots:n >> Sets a threshold for the number of dots which must >> appear >> in a name given to res_query(3) (see resolver(3)) >> before >> an initial absolute query will be made. The default >> for >> n is 1, meaning that if there are any dots in a name, >> the >> name will be tried first as an absolute name before >> any >> search list elements are appended to it. The value >> for >> this option is silently capped to 15. >> >> This one says that it simply determines whether the name will be tried >> as is *before* appending the search domain(s) to it, or whether it just >> skips straight to appending the search domains. >> > > Doesn't that say that, in my second example it will try ipv4.wlan.dirac., > get NXDOMAIN, and pass that up the stack.
host and dig are non-standard. or use non-standard name lookups? library?? In any case, try your example with ping or ssh - the search list will be applied after the initial NXDOMAIN Lee
