Re: mod_auth_kerb2 broken in 8-STABLE? Or is it heimdal to blame?

2012-10-19 Thread George Mamalakis
On 19/10/2012 02:19 πμ, John Marshall wrote: On 02/10/2012 02:08, George Mamalakis wrote: On 04/07/11 14:08, George Mamalakis wrote: On 06/04/2011 18:29, George Mamalakis wrote: Dear all, I installed mod_auth_kerb2 on my FreeBSD 8-STABLE machine and tried to use it. After the installation

Re: mod_auth_kerb2 broken in 8-STABLE? Or is it heimdal to blame?

2012-10-01 Thread George Mamalakis
On 04/07/11 14:08, George Mamalakis wrote: On 06/04/2011 18:29, George Mamalakis wrote: Dear all, I installed mod_auth_kerb2 on my FreeBSD 8-STABLE machine and tried to use it. After the installation (which was successful(?!?)), the server refused to start giving the error: # /usr/local

Re: pf nat fails on msk0 from packets deriving from a jail interface

2012-08-09 Thread George Mamalakis
On 08/09/12 20:00, YongHyeon PYUN wrote: On Wed, Aug 08, 2012 at 02:33:25PM +0300, George Mamalakis wrote: Hi all, Suddenly I am facing a problem on a new PC, using a configuration that I have been using on more than 10 servers for the last few years. The only thing that I find that differs

pf nat fails on msk0 from packets deriving from a jail interface

2012-08-08 Thread George Mamalakis
se simple routing instead, so there won't be a problem for me. I am just sending this info in case this is a bug with pf-msk driver (for the specific card?) and before I send a bug report, I'd like a second opinion in case I am missing something fundamental. Thanx all in advance. -- G

Re: grow zpool on a mirror setup

2012-03-15 Thread George Mamalakis
On 03/15/12 18:25, Marco van Tol wrote: On Thu, Mar 15, 2012 at 02:00:48PM +0200, George Mamalakis wrote: Hello everybody, I have asked the same question in the freebsd forums, but had no luck. Apart of this, there might be a bug somewhere, so I re-ask the question to this list. Here how it

Re: grow zpool on a mirror setup

2012-03-15 Thread George Mamalakis
Trond, thank you for your reply. Now to my questions: On 03/15/12 14:45, Trond Endrestøl wrote: On Thu, 15 Mar 2012 14:00+0200, George Mamalakis wrote: "I am experimenting with one installation of FreeBSD-9-STABLE/amd64 on a VirtualBox that is using gptzfsboot on a raid-1 (mirrored) zfs

grow zpool on a mirror setup

2012-03-15 Thread George Mamalakis
7;s a workaround. " As stated in these posts, it's really strange that zpool list doesn't seem to react even if I set the expand flag (or autoexpand which is the same), hence my concern whether this could be a bug. Thank you all for your time, -- George Mamalakis IT and Secu

Re: audit in jail

2012-03-02 Thread George Mamalakis
On 03/02/12 18:17, George Mamalakis wrote: Ah! And one more thing with respect to this issue. Since I realized that probably I won't be able to run audit within a jail, I tried to continue with my work from outside the jail. What I need is to audit some system users (like www) insi

RE: audit in jail

2012-03-02 Thread George Mamalakis
-awww -mfr /bin/ls setaudit: setaudit_addr: Function not implemented Is there, at least, some easy/secure/not-whole-system-configuration-changing way to start apache from within a jail to be able to audit his actions from outside the jail? Thank you all in advance, once more. -- George Mamalak

audit in jail

2012-03-02 Thread George Mamalakis
at audit does not run in jails? And if so, are there any thoughts on implementing in the near future? Thank you all for your help and time in advance. -- George Mamalakis IT and Security Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College o

Re: mod_auth_kerb2 broken in 8-STABLE? Or is it heimdal to blame?

2011-04-07 Thread George Mamalakis
On 06/04/2011 18:29, George Mamalakis wrote: Dear all, I installed mod_auth_kerb2 on my FreeBSD 8-STABLE machine and tried to use it. After the installation (which was successful(?!?)), the server refused to start giving the error: # /usr/local/etc/rc.d/apache22 start Performing sanity

mod_auth_kerb2 broken in 8-STABLE? Or is it heimdal to blame?

2011-04-06 Thread George Mamalakis
email to the stable list for two reasons: First, someone else may be having a similar problem and wants to find a rough solution. Secondly, there are people reading this list that know heimdal's code, so somebody may know another (much more elegant) way to fix this bug. Thank you all for

NFS tuning over ZFS

2011-03-29 Thread George Mamalakis
ill my filesystem be safe in a case of power outage? 2) Is there a good, up-to-date guide for NFS performance for FreeBSD? Thank you all for your time in advance, mamalos -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College

Re: nsswitch problems

2011-03-28 Thread George Mamalakis
On 28/03/2011 11:43, George Mamalakis wrote: On 24/03/2011 16:28, George Mamalakis wrote: Hello everybody, In short: nsswitch seems not to honor (fully) the criteria and actions of nsswitch.conf. A detailed analysis of my problem can be found on this thread (it's on freebsd forums, a

Re: nsswitch problems

2011-03-28 Thread George Mamalakis
On 24/03/2011 16:28, George Mamalakis wrote: Hello everybody, In short: nsswitch seems not to honor (fully) the criteria and actions of nsswitch.conf. A detailed analysis of my problem can be found on this thread (it's on freebsd forums, and it hasn't been answered ye

nsswitch problems

2011-03-24 Thread George Mamalakis
nk you all for your time and help in advance, I hope that somebody will help me realize how nsswitch works, so as to see if and how caching may help me on an nss_ldap authenticated configuration, regards, mamalos -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristo

Re: vm.swap_reserved toooooo large?

2010-12-19 Thread George Mamalakis
On 19/12/2010 00:17, Ronald Klop wrote: On Sat, 18 Dec 2010 12:52:10 +0100, George Mamalakis wrote: Oliver, I am sending you this email outside the list, because I think that That didn't work out as you intended. :-) replying on email

Re: vm.swap_reserved toooooo large?

2010-12-18 Thread George Mamalakis
Oliver, I am sending you this email outside the list, because I think that enough emails have been sent regarding my message. Now to your statements: On 18/12/2010 11:47 πμ, Oliver Fromme wrote: George Mamalakis wrote: > Oliver, thanx for your comments. I know it is difficult to cho

Re: vm.swap_reserved toooooo large?

2010-12-16 Thread George Mamalakis
On 16/12/2010 18:56, Oliver Fromme wrote: George Mamalakis wrote: > My dmesg shows: > > pid 1732 (npviewer.bin), uid 1001: exited on signal 11 (core dumped) > pid 2227 (npviewer.bin), uid 1001: exited on signal 11 (core dumped) > swap zone exhausted, increase

Re: vm.swap_reserved toooooo large?

2010-12-15 Thread George Mamalakis
On 15/12/2010 15:51, Kostik Belousov wrote: On Wed, Dec 15, 2010 at 03:43:56PM +0200, George Mamalakis wrote: On 15/12/2010 13:26, Trond Endrest??l wrote: On Wed, 15 Dec 2010 13:04+0200, George Mamalakis wrote: I was testing a program that would exhaust all my memory (in C++), and when this

Re: vm.swap_reserved toooooo large?

2010-12-15 Thread George Mamalakis
On 15/12/2010 13:26, Trond Endrestøl wrote: On Wed, 15 Dec 2010 13:04+0200, George Mamalakis wrote: I was testing a program that would exhaust all my memory (in C++), and when this would happen, it would call set_new_handler() along with one of my functions that would inform the user about the

vm.swap_reserved toooooo large?

2010-12-15 Thread George Mamalakis
ing something very fundamental? Thank you all for your time in advance. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aristot

Re: chflags on zfs (sappnd)

2010-11-18 Thread George Mamalakis
On 17/11/2010 21:25, Markus Gebert wrote: On 17.11.2010, at 20:00, Andriy Gapon wrote: on 17/11/2010 18:38 Markus Gebert said the following: On 17.11.2010, at 11:49, George Mamalakis wrote: Hi everbody, from http://wiki.freebsd.org/ZFS I understand that chflags are supported by zfs. But

chflags on zfs (sappnd)

2010-11-17 Thread George Mamalakis
t/obj/mnt/src/sys/GENERIC amd64 Thank you all for your time in advance, mamalos -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aristotle U

Re: fbsd8_stable nfsv3 sys=krb5 issue [resolved]

2010-09-17 Thread George Mamalakis
On 16/09/2010 16:44, George Mamalakis wrote: Hi all, I re-decided to move my nfs server from solaris to fbsd. So I am using test machines to see if it works. I have my kerberos realm configured, and seems to work fine, both nfsserver and nfsclient have their host and nfs keytabs stored in

Re: fbsd8_stable nfsv3 sys=krb5 issue

2010-09-16 Thread George Mamalakis
around to fixing it. No problem!! I understand that everybody's time is precious. It is more than enough that you even remember it (I had forgotten it myself:-) ) Thanx again for the time and help. mamalos -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle U

fbsd8_stable nfsv3 sys=krb5 issue

2010-09-16 Thread George Mamalakis
/exports, and type mount_nfs -onsfsv3,sec=krb5 ...blabla... on the client, everything seems to work ok, but then again no kerberos "protection" is applicable (I am able to rw in /mnt/mamalos folders as mamalos without having obtained any ticket). I assume that I must have forgotten

Re: AoE driver for FBSD8 or later?

2010-09-14 Thread George Mamalakis
On 14/9/2010 4:35 ??, Max Khon wrote: George, On Tue, Sep 14, 2010 at 5:01 PM, George Mamalakis <mailto:mama...@eng.auth.gr>> wrote: On Mon, Sep 13, 2010 at 7:53 PM, Max Khon mailto:f...@samodelkin.net> <mailto:f...@samodelkin.net <mailto:f...@samod

Re: AoE driver for FBSD8 or later?

2010-09-14 Thread George Mamalakis
.org/%7Efjoe/aoe-2.tar.gz> Max Max, thank you very much for your help. The driver works fine; I am able to see all 13T. In case something goes wrong I will inform you. For the time being, everything is OK. mamalos -- George Mamalakis IT Officer Electrical and Computer Engineer (A

Re: AoE driver for FBSD8 or later?

2010-09-13 Thread George Mamalakis
On 13/09/2010 08:41, Max Khon wrote: George, On Sat, Sep 11, 2010 at 12:12 AM, George Mamalakis mailto:mama...@eng.auth.gr>> wrote: On 10/09/2010 19:05, pluknet wrote: On 10 September 2010 17:32, George Mamalakismailto:mama...@eng.auth.gr>>

Re: AoE driver for FBSD8 or later?

2010-09-10 Thread George Mamalakis
On 10/09/2010 19:05, pluknet wrote: On 10 September 2010 17:32, George Mamalakis wrote: Hi everybody, we have a coraid device with 15x1GB disks on it, and would like to use it with fbsd8 (zfs, etc). The http://support.coraid.com/support/freebsd/ is really outdated, and the port that

AoE driver for FBSD8 or later?

2010-09-10 Thread George Mamalakis
migrating the driver onto fbsd8 or should I plug the coraid on a linux system and use it from there? Thank you all in advance. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-07-14 Thread George Mamalakis
On 14/7/2010 12:32 μμ, Jeremy Chadwick wrote: On Wed, Jul 14, 2010 at 11:56:57AM +0300, George Mamalakis wrote: On 14/7/2010 11:42 πμ, Reko Turja wrote: I have a problem: ldapsearch results in "Segmentation fault" under openldap-2.4.23 with cyrus-sasl-2.1.23 A thread f

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-07-14 Thread George Mamalakis
On 14/7/2010 11:42 πμ, Reko Turja wrote: I have a problem: ldapsearch results in "Segmentation fault" under openldap-2.4.23 with cyrus-sasl-2.1.23 A thread for similar issues was started by George Mamalakis back in february: http://lists.freebsd.org/pipermail/freebsd-stable/2010-Febru

mount_newnfs & mount_nullfs problem.

2010-03-01 Thread George Mamalakis
86 i86pc Solaris # share -F nfs -o sec=sys,rw,ro...@192.168.100.12 /export/homes 192.168.100.12 where 192.168.100.12 is fbsd-box's IP. Thank you all. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) D

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-02-25 Thread George Mamalakis
same test (so no need to ld_preload anything), but shares the same problem with i386 when /etc/hosts is not as expected (to recreate the /etc/hosts problem, place in your /etc/hosts file two fqdns for the ldap server's IP, but write the ldap server's fqdn second in turn). Thank yo

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-02-25 Thread George Mamalakis
On 11/02/2010 20:45, George Mamalakis wrote: 4: SASL/GSSAPI authentication started ldap_sasl_interactive_bind_s: Local error (-2) additional info: SASL(-1): generic failure: GSSAPI Error: Miscellaneous failure (see text) (unknown mech-code 2529638919 for mech unknown) which is very

Re: mountd segfaults in NFSv4 if -alldirs is present in exports

2010-02-19 Thread George Mamalakis
On 19/02/2010 20:11, George Mamalakis wrote: [r...@fbsdclient ~]# mount_newnfs -onfsv4,sec=krb5 filesrv.ee.auth.gr:/export /mnt nfsv4 err=10016 mount_newnfs: /mnt, : Input/output error I performed some more test on this setup and I can shed a bit more light to the issue. My /etc/export on

Re: mountd segfaults in NFSv4 if -alldirs is present in exports

2010-02-19 Thread George Mamalakis
On 19/02/2010 18:24, Rick Macklem wrote: On Fri, 19 Feb 2010, George Mamalakis wrote: Hi all, the title explains it all... But ok, let's be a bit more extensive. If I have one line in /etc/exports reading: V4: / -alldirs and try to start mountd, it segfaults with signal 11. Fro

Re: mountd segfaults in NFSv4 if -alldirs is present in exports

2010-02-19 Thread George Mamalakis
On 19/02/2010 17:44, George Mamalakis wrote: Hi all, the title explains it all... But ok, let's be a bit more extensive. If I have one line in /etc/exports reading: V4: / -alldirs and try to start mountd, it segfaults with signal 11. From the manpage I read that -alldirs is the &q

mountd segfaults in NFSv4 if -alldirs is present in exports

2010-02-19 Thread George Mamalakis
mmy instead of -alldirs and mountd won't segfault, hence there's no problem with its parser. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering F

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-02-19 Thread George Mamalakis
On 17/02/2010 12:39, George Mamalakis wrote: On 13/02/2010 00:23, George Mamalakis wrote: On 12/2/2010 8:48 πμ, jhell wrote: This is a lot of information to consume. Lets start with this: All of the machines in question are of some form of FreeBSD 8. You enter gdb and very clearly it

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-02-17 Thread George Mamalakis
On 13/02/2010 00:23, George Mamalakis wrote: On 12/2/2010 8:48 πμ, jhell wrote: This is a lot of information to consume. Lets start with this: All of the machines in question are of some form of FreeBSD 8. You enter gdb and very clearly it starts whining about a segfault & libc.so.7

Re: openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-02-12 Thread George Mamalakis
On 12/2/2010 8:48 πμ, jhell wrote: This is a lot of information to consume. Lets start with this: All of the machines in question are of some form of FreeBSD 8. You enter gdb and very clearly it starts whining about a segfault & libc.so.7 Did you happen to upgrade these clients & server f

openldap client GSSAPI authentication segfaults in fbsd8stable i386

2010-02-11 Thread George Mamalakis
y machine that works seamlessly (until now, at least) is the heimdal/ldap server. Thank you all in advance and I hope that we will find an answer to all this. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Depart

Re: A more secure approach of jail establishment. It could be included in jail chapter of fbsd handbook

2010-02-10 Thread George Mamalakis
oting the jail easier. Of course, this is just my opinion and I think it is more of a matter of "taste" on how someone would want to setup their jails. Thank you for your answer. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (I

A more secure approach of jail establishment. It could be included in jail chapter of fbsd handbook

2010-02-10 Thread George Mamalakis
ublishing it to some blog,forum,etc. Thank you all for your time. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aris

Re: Kerberized NFSv3 incorrect behavior

2010-02-08 Thread George Mamalakis
On 08/02/2010 00:34, Rick Macklem wrote: On Sat, 6 Feb 2010, George Mamalakis wrote: thank you for all your answers. I am planning on setting up the computer labs of my department using kerberized nfsv3 (since v4 seems to be "more" experimental) with a FreeBSD nfs server and

Re: Kerberized NFSv3 incorrect behavior

2010-02-06 Thread George Mamalakis
Rick Macklem wrote: On Fri, 5 Feb 2010, George Mamalakis wrote: Dear all, I am running FBSD8-STABLE on an nfsv3 server and an nfsv3 client. My configuration is based on http://code.google.com/p/macnfsv4/wiki/FreeBSD8KerberizedNFSSetup. My goal is to share filesystems securely through

Kerberized NFSv3 incorrect behavior (revisited)

2010-02-05 Thread George Mamalakis
r renew its kerberos' cache. Thank you all, again, for your time. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aristotle University of T

Kerberized NFSv3 incorrect behavior

2010-02-05 Thread George Mamalakis
this behavior is not the one to be expected, except if I am missing some fundamental information about kerberized NFS that explains it. Even so, it would be quite unwise to behave so, since even if the users kdestroys their tickets, they have still all permissions as when they obtained th

Base system's Heimdal with Openldap support?

2009-09-23 Thread George Mamalakis
tribution gets configured with openldap backend) In case I have sent this question in the wrong list, please somebody inform me so. Thank you all in advance. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Dep

Re: MSI GT 627 unsuccessful installation in 7-STABLE and 8-BETA4

2009-09-23 Thread George Mamalakis
Manolis Kiagias wrote: George Mamalakis wrote: Dear all, My question should maybe have be sent to some other fbsd list; if so, please someone instruct me where, and excuse me for my potential mistake. Now to my question: I just bought the MSI GT 627 Laptop, and I tried to install FreeBSD

Re: SASL problems with spnego on 8.0-BETA4

2009-09-21 Thread George Mamalakis
all very very much for your help! I posted my query on the 17th of Sep. and in four days (weekend inclusive!) someone came up with an answer that resolves my issue! Great job, once more, and thank you all again! -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un.

Re: SASL problems with spnego on 8.0-BETA4

2009-09-18 Thread George Mamalakis
John Marshall wrote: On Thu, 17 Sep 2009, 21:28 +0300, George Mamalakis wrote: Dear all, I am trying to setup ldap with heimdal on my fbsd 8.0-BETA4 and when I run ldapsearch to see if I can authenticate via GSSAPI I keep getting the following error: [r...@ldap root]# ldapsearch -H

SASL problems with spnego, heimdal, AND openldap on 8.0-BETA4

2009-09-18 Thread George Mamalakis
if he could share it on this list. Thanx again for reading. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aristot

SASL problems with spnego on 8.0-BETA4

2009-09-17 Thread George Mamalakis
one knows anything, I would be grateful if I could have a hint. Thank you all for your time in advance. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engin

MSI GT 627 unsuccessful installation in 7-STABLE and 8-BETA4

2009-09-11 Thread George Mamalakis
Thank you all for your interest. Regards, mamalos. -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aristotle University of Thessaloniki

Re: FreeBSD 8.0-BETA4 IBM ServerRaid 8k issues

2009-09-11 Thread George Mamalakis
* disk (it calculates to something like ~178MBps); but have you tried it on your disks, and everything works OK since (along with performance)? Thank you all again for your answers, you've been truly helpful! -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of The

Re: FreeBSD 8.0-BETA4 IBM ServerRaid 8k issues

2009-09-10 Thread George Mamalakis
ee partitions > 2T in the future (or now?!), please say how :). -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Electrical and Computer Engineering Faculty of Engineering Aristot

FreeBSD 8.0-BETA4 IBM ServerRaid 8k issues

2009-09-10 Thread George Mamalakis
uld be very annoying, as far as the server's efficiency (and/or maybe stability) is concerned. The kernel is GENERIC-amd64 and untouched, if someone may need more information (eg, dmesg output) please do not hesitate to say so. Thank you all for your time in advance, mamalos -- Geo

FREEBSD 7.1-STABLE crashes when trying to mount USB device of solaris UFS filesystem

2009-02-04 Thread George Mamalakis
dules/rtc.ko...done. Loaded symbols for /usr/local/modules/rtc.ko #0 doadump () at pcpu.h:196 196pcpu.h: No such file or directory. in pcpu.h (kgdb) I will csup my box to the latest freebsd-stable and see if the problems persist. If not, I hope this message will help somebody to fi

Re: jails and mac_seeotheruids problems in 6-STABLE

2008-10-01 Thread George Mamalakis
Robert Watson wrote: On Tue, 30 Sep 2008, George Mamalakis wrote: It works like a charm! Thank you very much for your time and help, No problem -- I've gone ahead and committed that change to stable/6. If you're able to test 6.4RC1 when it comes out to confirm that the fix work

Re: jails and mac_seeotheruids problems in 6-STABLE

2008-09-30 Thread George Mamalakis
It works like a charm! Thank you very much for your time and help, regards, Robert Watson wrote: On Tue, 30 Sep 2008, George Mamalakis wrote: I have 3 servers in my lab. 2 of them are running 6-STABLE and one of them is running 7-STABLE. All three have services running in jails. I

jails and mac_seeotheruids problems in 6-STABLE

2008-09-30 Thread George Mamalakis
if someone could inform me whether I am doing something wrong; if not I think I should inform FreeBSD about this bug. Thank you guys in advance, -- George Mamalakis IT Officer Electrical and Computer Engineer (Aristotle Un. of Thessaloniki), MSc (Imperial College of London) Department of Elec