do I have to compile a new kernel? or just add options somehow?

[Fleuriot Damien]

As I said earlier, you might not need to rebuild it, but I can't say if IPsec Nat Traversal is enabled in the module.



On Dec 5, 2013, at 9:41 PM, "firmdog at gmail.com" <firmdog at gmail.com> wrote:

> 
> I ran  #kldload crypto.  Did you see that?  Then I ran kldstat and it shows the module loaded.
> 
> Why do I have to recompile the kernel if I can run kldload or use loader.conf to load the module at boot time?
> 
> 
> 
> 
> 
> On Thu, Dec 5, 2013 at 12:13 PM, Fleuriot Damien <ml at my.gd> wrote:
> Merely adding the options and rebooting is not sufficient to get the options from your kernel as opposed to a module.
> 
> You need to actually recompile the kernel, I hope you did that.
> 
> 
> On Dec 5, 2013, at 5:48 PM, "firmdog at gmail.com" <firmdog at gmail.com> wrote:
> 
>> 
>> Looks like it "might have" worked for me. First I added a couple of options to the GENERIC config:
>> 
>> root@:~ # grep IPSEC /usr/src/sys/i386/conf/GENERIC
>> options         IPSEC           # IP security (requires device crypto)
>> options         IPSEC_NAT_T     # NAT-T support, UDP encap of ESP
>> 
>> Then rebooted:
>> 
>> root@:~ # uname -a
>> FreeBSD  8.4-RELEASE FreeBSD 8.4-RELEASE #0 r251259: Mon Jun  3 01:14:28 UTC 2013     root at bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC  i386
>> 
>> root@:~ # kldload crypto
>> root@:~ # kldstat 
>> Id Refs Address    Size     Name
>>  1    5 0xc0400000 d5c4ec   kernel
>>  2    1 0xc58eb000 23000    crypto.ko
>>  3    1 0xc58da000 a000     zlib.ko
>> 
>> 
>> The reason I am doing this is because a new Cisco VPN router will not work with my IPF Freebsd firewall. The IPF firewall blocks the UDP ipsec packets on port 4500. So now I need to see if doing the above exercise helps with IPF blocking IPsec traversal across NAT
>> 
>> 
>> 
>> 
>> On Thu, Dec 5, 2013 at 10:57 AM, Fleuriot Damien <ml at my.gd> wrote:
>> Oh but you can load modules at boot time for GENERIC just fine.
>> 
>> While there is a "crypto" module nested under /usr/src/sys/modules/crypto/ , I'm not familiar enough with it to say whether it incorporates both the device and the IPSEC options you're interested in.
>> 
>> You're better off rebuilding GENERIC, or your own kernel, IMHO.
>> 
>> 
>> 
>> If you're curious, you can always run :
>> kldload crypto
>> 
>> If kldload says the module doesn't exist (I think it should, for GENERIC), you'll need to build it:
>> cd /usr/src/sys/modules/crypto/ && make && make install
>> 
>> 
>> 
>> Here's little me trying to load it under a brand new 8.4 box:
>> 
>> # kldload /boot/kernel/crypto.ko
>> kldload: can't load /boot/kernel/crypto.ko: Exec format error
>> 
>> 
>> If you run into this error like me, "dmesg" will provide you with a clue, as it does in my case:
>> KLD crypto.ko: depends on zlib - not available or version mismatch
>> linker_load_file: Unsupported file type
>> 
>> 
>> 
>> I really encourage you to rebuild your own kernel, stripped of all the stuff you don't want/need (ISA NICs, wifi, firewire, floppy controller... )
>> 
>> 
>> Warren Block has written pretty cool articles, here:
>> http://www.wonkity.com/~wblock/docs/html/buildworld.html
>> http://www.wonkity.com/~wblock/docs/html/kernelconfig.html
>> 
>> 
>> 
>> 
>> I hope that helps,
>> 
>> 
>> On Dec 5, 2013, at 4:30 PM, "firmdog at gmail.com" <firmdog at gmail.com> wrote:
>> 
>>> 
>>> So the answer is that it's NOT possible to load modules at boot time for GENERIC? I have to actually build a new kernel?
>>> 
>>> Thanks!
>>> 
>>> 
>>> On Thu, Dec 5, 2013 at 9:42 AM, Fleuriot Damien <ml at my.gd> wrote:
>>> 
>>> On Dec 5, 2013, at 3:35 PM, "firmdog at gmail.com" <firmdog at gmail.com> wrote:
>>> 
>>> > I am having difficulty understanding what is compiled into the GENERIC
>>> > kernel.
>>> >
>>> > I need to enable "device crypto" with IPSEC and IPSEC_NAT_T options.
>>> >
>>> > Can I just configure the GENERIC kernel in a config file? Or do I have to
>>> > compile a totally new kernel?
>>> > _______________________________________________
>>> > freebsd-questions at freebsd.org mailing list
>>> > http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>> > To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
>>> 
>>> 
>>> While it's far from being a good practice, you can simply add your:
>>> device crypto
>>> options IPSEC
>>> options IPSEC_NAT_T
>>> 
>>> to /sys/amd64/conf/GENERIC (assuming you're running a 64bit release that is).
>>> 
>>> 
>>> Then: cd /usr/src && make kernel-toolchain && make buildkernel
>>> 
>>> Once the kernel is built, you only need to "make installkernel" and reboot.
>>> 
>>> It is good practice, before rebooting, to run "mergemaster -p" , even if you've only done a minor upgrade, let good habits sink in ;)
>>> 
>>> 
>>> 
>>> 
>>> Regarding what is compiled in the GENERIC kernel, you can find the included options and devices at:
>>> /sys/amd64/conf/GENERIC
>>> or
>>> /sys/i386/conf/GENERIC
>>> 
>>> You may also run config -x /boot/kernel/kernel , if your kernel was built with INCLUDE_CONFIG_FILE , which GENERIC does.
>>> 
>>> 
>> 
>> 
> 
>