Settup a Squid proxy server which can be accessed by multiple IP domain

Proxy是很常見的服務，經常拿來作為建立連線分享控管之後，我們也可以藉由建立Proxy的方式，讓使用者存取另一條專線。在學術網路中，因為對國外頻寬不足，連線大陸或其他國家網站速度相當的慢，因此有申請另外一條中華電信的線路做備援或者是存取國外網站。

最基本的需求是兩張網路卡，一張連接Hinet線路，IP為158.95.100.100，另外一張則是連接學術網路140.120.1.100，同時我們希望140.120.1-4.0都能存取這台Proxy。

在這裡最大的問題是我們必須設定Hinet的Gateway為Default Gateway，這樣才能在學術網路出問題時由外連進學網內。但當我們設定Hinet為Default Gateway後，學術網路的IP變成Local IP Domain，只有同一IP Domain的才能存取，因此我們必須額外設定route連線至學網。

我們使用ubuntu server作為我們的OS。
先安裝squid http proxy

yum install squid

接著設定能夠存取這台Proxy的ACL

acl NCHU1 src 140.120.1.0/255.255.255.0
acl NCHU2 src 140.120.2.0/255.255.255.0
acl NCHU3 src 140.120.3.0/255.255.255.0
acl NCHU4 src 140.120.4.0/255.255.255.0

在設定允許允許這些IP能存取HTTP服務

http_access allow NCHU1
http_access allow NCHU2
http_access allow NCHU3
http_access allow NCHU4

最後需要設定啟動的網路設定腳本，檔案在/etc/network/interface

auto eth0
iface eth0 inet static
address 140.120.1.100
netmask 255.255.255.0
network 140.120.1.0
broadcast 140.120.1.255
dns-nameservers 140.120.1.2
dns-search nchu.edu.tw
up route add -net 140.120.2.0 netmask 255.255.255.0 gw 140.120.31.254 dev eth0
up route add -net 140.120.3.0 netmask 255.255.255.0 gw 140.120.31.254 dev eth0
up route add -net 140.120.4.0 netmask 255.255.255.0 gw 140.120.31.254 dev eth0
up route add -net 140.120.0.0 netmask 255.255.0.0 gw 140.120.31.254 dev eth0
up route add -net 140.0.0.0 netmask 255.0.0.0 gw 140.120.31.254 dev eth0

auto eth1
iface eth1 inet static
address 168.09.1.100
netmask 255.255.255.0
network 168.95.1.0
broadcast 168.95.1.255
gateway 168.95.1.254

接著設定Proxy.pac，讓校內之間的連線都不使用Proxy，存取各種期刊也不使用Proxy。

function FindProxyForURL(url, host)
{
reip = /^\d+\.\d+\.\d+\.\d+$/g;
if ((host == "localhost") ||
(shExpMatch(host, "localhost.*")) ||
(host == "127.0.0.1")) {
return "DIRECT";
}

else if (reip.test(host)) {
if( isInNet(host, "10.0.0.0", "255.0.0.0") ||
isInNet(host, "192.168.0.0", "255.255.0.0") ||
isInNet(host, "172.16.0.0", "255.240.0.0") )
return "DIRECT";
else if (isInNet(host, "140.120.0.0", "255.255.0.0"))
return "DIRECT";
}


else if( isInNet(myIpAddress(), "140.120.1.0", "255.255.255.0") ||
isInNet(myIpAddress(), "140.120.2.0", "255.255.255.0") ||
isInNet(myIpAddress(), "140.120.3.0", "255.255.255.0") ||
isInNet(myIpAddress(), "140.120.4.0", "255.255.255.0") )
{

if (isPlainHostName(host) ||
dnsDomainIs(host, ".edu.tw") ||
dnsDomainIs(host, ".com.tw") ||
dnsDomainIs(host, ".gov.tw") ||
dnsDomainIs(host, ".yahoo.com") ||
dnsDomainIs(host, ".yimg.com") ||
dnsDomainIs(host, ".hinet.net") ||
dnsDomainIs(host, ".acm.org") ||
dnsDomainIs(host, ".ieee.org")
)
return "DIRECT";

else if (
shExpMatch(host,"*.idealibrary.com") ||
shExpMatch(host,"*.ieee.org") ||
shExpMatch(host,"*.ihs.com") ||
shExpMatch(host,"*.academicpress.com") ||
shExpMatch(host,"*.apcatalog.com") ||
shExpMatch(host,"*.hbuk.co.uk") ||
shExpMatch(host,"*.harcourt.com") ||
shExpMatch(host,"*.mkp.com") ||
shExpMatch(host,"*.johnsmith.co.uk") ||
shExpMatch(host,"*.heffers.co.uk") ||
shExpMatch(host,"*.infolearning.com") ||
shExpMatch(host,"*.grolier.com") ||
shExpMatch(host,"*.shop.barnesandnoble.com") ||
shExpMatch(host,"*.akamaitech.net") ||
shExpMatch(host,"*.harcourtbrace.com") ||
shExpMatch(host,"*.apnet.net") ||
shExpMatch(host,"*.epnet.com") ||
shExpMatch(host,"*.epnet.net") ||
shExpMatch(host,"*.springer.de") ||
shExpMatch(host,"*.springer-ny.com") ||
shExpMatch(host,"*.siam.org") ||
shExpMatch(host,"*.stic.gov.tw") ||
shExpMatch(host,"*.umi.com") ||
shExpMatch(host,"e-lib.nctu.edu.tw") ||
shExpMatch(host,"*.ams.org") ||
shExpMatch(host,"*.aip.org") ||
shExpMatch(host,"*.asme.org") ||
shExpMatch(host,"*.ejournal.ascc.net") ||
shExpMatch(host,"*.swetsnetnavigator.com") ||
shExpMatch(host,"*.swetsnetnavigator.nl") ||
shExpMatch(host,"*.apcatalog.com") ||
shExpMatch(host,"www.scienceonline.org") ||
shExpMatch(host,"www.nature.com") ||
shExpMatch(host,"jcrweb.com") ||
shExpMatch(host,"*.oclc.org") ||
shExpMatch(host,"*.cnki.net") ||
shExpMatch(host,"*.read.com.tw") ||
shExpMatch(host,"*.ncl.edu.tw") ||
shExpMatch(host,"*.ei.org") ||
shExpMatch(host,"*.csa.com") ||
shExpMatch(host,"www.ibisworld.com.tw") ||
shExpMatch(host,"www.wanfangduta.com.tw") ||
shExpMatch(host,"www.chemnetbase.com") ||
shExpMatch(host,"www.engnetbase.com") ||
shExpMatch(host,"www.cabi.org") ||
shExpMatch(host,"www.cabsubsets.org") ||
shExpMatch(host,"infotrac.galegroup.com") ||
shExpMatch(host,"*.catchword.com") ||
shExpMatch(host,"catchword.com") ||
shExpMatch(host,"*.interscience.wiley.com") ||
shExpMatch(host,"*.iop.org") ||
shExpMatch(host,"*.acs.org") ||
shExpMatch(host,"*.highwire.org") ||
shExpMatch(host,"*.netlibrary.com") ||
shExpMatch(host,"www.groveart.com") ||
shExpMatch(host,"www.grovemusic.com") ||
shExpMatch(host,"www.sciamarchive.org") ||
shExpMatch(host,"www.refworks.com.tw") ||
shExpMatch(host,"cjn.csis.com.tw") ||
shExpMatch(host,"www.genomebiology.com") ||
shExpMatch(host,"www.sciencedirect.com") ||
shExpMatch(host,"www.iospress.nl") ||
shExpMatch(host,"www.genome.org") ||
shExpMatch(host,"rsc.org") ||
shExpMatch(host,"www2.elsevier.co.uk") ||
shExpMatch(host,"www.worldscientific.com.sg") ||
shExpMatch(host,"www.journals.uchicago.edu") ||
shExpMatch(host,"physiolgenomics.org") ||
shExpMatch(host,"ovid.digilib.nctu.edu.tw") ||
shExpMatch(host,"*.jjap.or.jp") ||
shExpMatch(host,"*.engineeringvillage2.org") ||
shExpMatch(host,"*.metapress.com") ||
shExpMatch(host,"*.tandf.co.uk") ||
shExpMatch(host,"*.ebsco.com") ||
shExpMatch(host,"*.windeal.com.tw") ||
shExpMatch(host,"gateway.ovid.com") ||
shExpMatch(host,"gateway1.ovid.com") ||
shExpMatch(host,"gateway2.ovid.com") ||
shExpMatch(host,"gateway3.ovid.com") ||
shExpMatch(host,"gateway.ut.ovid.com") ||
shExpMatch(host,"*.isiknowledge.com") ||
shExpMatch(host,"mic.iii.org.tw") ||
shExpMatch(host,"www.journals.uchicago.edu") ||
shExpMatch(host,"web2.westlaw.com") ||
shExpMatch(host,"heinonline.org") ||
shExpMatch(host,"*.sciencemag.org") ||
shExpMatch(host,"swproxy.swetswise.com") ||
shExpMatch(host,"www.taiwantrade.com.tw") ||
shExpMatch(host,"news.taiwantrade.com.tw") ||
shExpMatch(host,"mi.compustst.com") ||
shExpMatch(host,"www.hinet.org.tw") ||
shExpMatch(host,"www.pubmedcentral.gov") ||
shExpMatch(host,"www.twpat.com") ||
shExpMatch(host,"www.swetswise.com") ||
shExpMatch(host,"www.springerlink.com") ||
shExpMatch(host,"www.haworthpress.com") ||
shExpMatch(host,"isi4.newisiknowledge.com") ||
shExpMatch(host,"isiknowledge.com") ||
shExpMatch(host,"www.dekker.com") ||
shExpMatch(host,"cnki.csis.com.tw") ||
shExpMatch(host,"kmw.ctgin.com") ||
shExpMatch(host,"Journals.Cambridge.org") ||
shExpMatch(host,"www.greatman.com.tw") ||
shExpMatch(host,"www.anb.org") ||
shExpMatch(host,"iospress.metapress.com") ||
shExpMatch(host,"www.ingenta.com") ||
shExpMatch(host,"www.blackwell-synergy.com") ||
shExpMatch(host,"www.lawbank.com.tw") ||
shExpMatch(host,"www.land.moi.gov.tw") ||
shExpMatch(host,"www.eduref.org") ||
shExpMatch(host,"www.biomedcentral.com") ||
shExpMatch(host,"www.wordpedia.com") ||
shExpMatch(host,"www.cabdirect.org") ||
shExpMatch(host,"srda.sinica.edu.tw") ||
shExpMatch(host,"www.ceps.com.tw") ||
shExpMatch(host,"www.thomastelford.com") ||
shExpMatch(host,"www.mycologia.org") ||
shExpMatch(host,"www.csa.com") ||
shExpMatch(host,"www.cna.com.tw") ||
shExpMatch(host,"heronpublishing.com") ||
shExpMatch(host,"www.poultryscience.org") ||
shExpMatch(host,"www.jbc.org") ||
shExpMatch(host,"www.genesdev.org") ||
shExpMatch(host,"pcift.chadwyck.com") ||
shExpMatch(host,"eebo.chadwyck.com") ||
shExpMatch(host,"www.lexisnexis.com") ||
shExpMatch(host,"www.lexis.com") ||
shExpMatch(host,"*.ingentaselect.com") ||
shExpMatch(host,"online.ttsgroup.com.tw") ||
shExpMatch(host,"*.infolinker.com.tw") ||
shExpMatch(host,"www.cwk.com.tw") ||
shExpMatch(host,"wisenews.wisers.net") ||
shExpMatch(host,"npmhost.npm.gov.tw") ||
shExpMatch(host,"*.jstor.org") ||
shExpMatch(host,"tie.tier.org.tw") ||
shExpMatch(host,"www3.oup.co.uk") ||
shExpMatch(host,"erl.sinica.edu.tw") ||
shExpMatch(host,"pqdd.sinica.edu.tw") ||
shExpMatch(host,"www.sinica.edu.tw") ||
shExpMatch(host,"srda.sinica.edu.tw") ||
shExpMatch(host,"twp.apipa.org.tw") ||
shExpMatch(host,"online.sfib.org.tw") ||
shExpMatch(host,"iris.emeraldinsight.com") ||
shExpMatch(host,"elvira.emeraldinsight.com") ||
shExpMatch(host,"tafs.allentrack.net") ||
shExpMatch(host,"aslo.org") ||
shExpMatch(host,"www.ingentaconnect.com") ||
shExpMatch(host,"csa.e-lib.nctu.edu.tw") ||
shExpMatch(host,"laumt.lib.cyut.edu.tw") ||
shExpMatch(host,"demo.ebookmatrix.net") ||
shExpMatch(host,"*.silverplatter.com") ||
shExpMatch(host,"www.credit.com.tw") ||
shExpMatch(host,"journals.cambridge.org") ||
shExpMatch(host,"web26.epnet.com") ||
shExpMatch(host,"afs.allenpress.com") ||
shExpMatch(host,"ejournals.ebsco.com") ||
shExpMatch(host,"MCB.ASM.ORG") ||
shExpMatch(host,"vnweb.hwwilsonweb.com") ||
shExpMatch(host,"www.aacr.org") ||
shExpMatch(host,"www.nature.com") ||
shExpMatch(host,"www.pdkintl.org") ||
shExpMatch(host,"ssreader.igroupnet.com.tw") ||
shExpMatch(host,"epublish.nict.gov.tw") ||
shExpMatch(host,"epublish.hyweb.com.tw") ||
shExpMatch(host,"www.scopus.com") ||
shExpMatch(host,"www.aslo.org") ||
shExpMatch(host,"ejournals.ebsco.com") ||
shExpMatch(host,"journals.mup.man.ac.uk") ||
shExpMatch(host,"www.embase.com") ||
shExpMatch(host,"www.the-aps.org") ||
shExpMatch(host,"physiology.org") ||
shExpMatch(host,"oupjournals.org") ||
shExpMatch(host,"*.oxfordjournals.org") ||
shExpMatch(host,"www.cellpress.com") ||
shExpMatch(host,"www.thieme-chemistry.com") ||
shExpMatch(host,"*.safaribooksonline.com") ||
shExpMatch(host,"www.ipap.jp") ||
shExpMatch(host,"journals.mup.man.ac.uk") ||
shExpMatch(host,"mup.mcc.ac.uk") ||
shExpMatch(host,"www.csa1.co.uk") ||
shExpMatch(host,"www.ingentaconnect.com") ||
shExpMatch(host,"www.rsc.org") ||
shExpMatch(host,"www.tunnelsonline.info") ||
shExpMatch(host,"estuaries.olemiss.edu") ||
shExpMatch(host,"afs.allenpress.com") ||
shExpMatch(host,"www.publish.csiro.au") ||
shExpMatch(host,"www.asme.org") ||
shExpMatch(host,"members.ift.org") ||
shExpMatch(host,"inpractice.bvapublications.com") ||
shExpMatch(host,"www.mycologia.org") ||
shExpMatch(host,"www.rsnz.org") ||
shExpMatch(host,"www.emeraldinsight.com") ||
shExpMatch(host,"muse.jhu.edu") ||
shExpMatch(host,"ser10.lib.nchu.edu.tw") ||
shExpMatch(host,"www.jaaha.org ") ||
shExpMatch(host,"www.jwildlifedis.org") ||
shExpMatch(host,"www.jvetintmed.org") ||
shExpMatch(host,"*.wisers.net") ||
shExpMatch(host,"www.cnsonline.com.tw") ||
shExpMatch(host,"nchu.lib.apabi.com") ||
shExpMatch(host,"www.informaworld.com") ||
shExpMatch(host,"www-cal.csa.com") ||
shExpMatch(host,"gateway.proquest.com") ||
shExpMatch(host,"www.mcponline.org") ||
shExpMatch(host,"www.asbmb.org") ||
shExpMatch(host,"www.electronicipc.com") ||
shExpMatch(host,"www.ashs.org") ||
shExpMatch(host,"*.sgmjournals.org") ||
shExpMatch(host,"www.atypon-link.com") ||
shExpMatch(host,"www.degruyter.de") ||
shExpMatch(host,"www.phycologia.org") ||
shExpMatch(host,"www.aiaa.org") ||
shExpMatch(host,"www.astm.org") ||
shExpMatch(host,"www.liebertonline.com") ||
shExpMatch(host,"jvdi.org") ||
shExpMatch(host,"cmr.asm.org") ||
shExpMatch(host,"dx.doi.org") ||
shExpMatch(host,"www.plantphysiol.org") ||
shExpMatch(host,"www.aviationweek.com") ||
shExpMatch(host,"caliber.ucpress.net") ||
shExpMatch(host,"www.palgrave-journals.com") ||
shExpMatch(host,"avmajournals.avma.org") ||
shExpMatch(host,"www.iahr.net") ||
shExpMatch(host,"www.foreignpolicy.com") ||
shExpMatch(host,"www.iijournals.com") ||
shExpMatch(host,"www2.us.elsevierhealth.com") ||
shExpMatch(host,"www.vetclinpathjournal.org") ||
shExpMatch(host,"www.jcb.org") ||
shExpMatch(host,"www.mapress.com") ||
shExpMatch(host,"www.cfapubs.org") ||
shExpMatch(host,"www.jstage.jst.go.jp") ||
shExpMatch(host,"mcfarland.metapress.com") ||
shExpMatch(host,"veterinaryrecord.bvapublications.com") ||
shExpMatch(host,"endo.endojournals.org") ||
shExpMatch(host,"www.jcronline.org") ||
shExpMatch(host,"www.mlajournals.org") ||
shExpMatch(host,"www.hljournals.org") ||
shExpMatch(host,"www.envplan.com") ||
shExpMatch(host,"www.biochemj.org") ||
shExpMatch(host,"www.istructe.org.uk") ||
shExpMatch(host,"www.radicalphilosophy.com") ||
shExpMatch(host,"www.manchesteruniversitypress.co.uk") ||
shExpMatch(host,"www.mitpressjournals.org") ||
shExpMatch(host,"www.esajournals.org") ||
shExpMatch(host,"www.jlr.org") ||
shExpMatch(host,"www.biolreprod.org") ||
shExpMatch(host,"www.jimmunol.org") ||
shExpMatch(host,"jn.nutrition.org") ||
shExpMatch(host,"www.fisheries.org") ||
shExpMatch(host,"ajp.amjpathol.org") ||
shExpMatch(host,"www.amjbot.org") ||
shExpMatch(host,"www.botany.org") ||
shExpMatch(host,"pubs.nrc-cnrc.gc.ca") ||
shExpMatch(host,"www.chemistry.or.jp") ||
shExpMatch(host,"engrwww.usask.ca") ||
shExpMatch(host,"www.electrochem.org") ||
shExpMatch(host,"www.coatingstech.org") ||
shExpMatch(host,"www.biotechniques.com") ||
shExpMatch(host,"jdt.osa.org") ||
shExpMatch(host,"www.mrs.org") ||
shExpMatch(host,"www.businessweek.com") ||
shExpMatch(host,"www.nacestore.com") ||
shExpMatch(host,"europa.eu") ||
shExpMatch(host,"www.biochemsoctrans.org") ||
shExpMatch(host,"www.sagamorepub.com") ||
shExpMatch(host,"www.reproduction-online.org") ||
shExpMatch(host,"wwwsoc.nii.ac.jp") ||
shExpMatch(host,"hk.wanfangdata.com") ||
shExpMatch(host,"bankscope.bvdep.com") ||
shExpMatch(host,"osiris.bvdep.com") ||
shExpMatch(host,"arjournals.annualreviews.org") ||
shExpMatch(host,"www.kdp.org") ||
shExpMatch(host,"sloanreview.mit.edu") ||
shExpMatch(host,"avdi.allenpress.com") ||
shExpMatch(host,"jjap.ipap.jp") ||
shExpMatch(host,"www.discoverygate.com") ||
shExpMatch(host,"www.hytung.com.tw") ||
shExpMatch(host,"tci.gcscholar.com") ||
shExpMatch(host,"www.lawdata.com.tw") ||
shExpMatch(host,"www.topology.com.tw") ||
shExpMatch(host,"reading.udn.com") ||
shExpMatch(host,"collections.chadwyck.co.uk") ||
shExpMatch(host,"www.spiedl.org") ||
shExpMatch(host,"www.geotechnique-ice.com") ||
shExpMatch(host,"www.concrete-research.com") ||
shExpMatch(host,"www.rsc.org") ||
shExpMatch(host,"www.aiaa.org") ||
shExpMatch(host,"*.uwpress.org") ||
shExpMatch(host,"newleftreview.org") ||
shExpMatch(host,"dukejournals.org") ||
shExpMatch(host,"www.rockefeller.edu") ||
shExpMatch(host,"www.journals.asm.org") ||
shExpMatch(host,"www.bloodjournal.org") ||
shExpMatch(host,"www.jgp.org") ||
shExpMatch(host,"mansci.journal.informs.org") ||
shExpMatch(host,"orgsci.journal.informs.org") ||
shExpMatch(host,"harvardbusinessonline.hbsp.harvard.edu") ||
shExpMatch(host,"www.internationaljournalofadvertising.com") ||
shExpMatch(host,"msom.journal.informs.org") ||
shExpMatch(host,"www.mineralogicalassociation.ca") ||
shExpMatch(host,"www.eje.cz") ||
shExpMatch(host,"www.msafungi.org") ||
shExpMatch(host,"www.genetics.org") ||
shExpMatch(host,"www.jleukbio.org") ||
shExpMatch(host,"www.aaap.info") ||
shExpMatch(host,"www.edpsciences.org") ||
shExpMatch(host,"www.rsmpress.co.uk") ||
shExpMatch(host,"www.vetpathology.org") ||
shExpMatch(host,"www.libraryjournal.com") ||
shExpMatch(host,"www.publishersweekly.com") ||
shExpMatch(host,"www.aspbs.com") ||
shExpMatch(host,"www.duncker-humblot.de") ||
shExpMatch(host,"*.ipap.jp") ||
shExpMatch(host,"*.sagepub.com") ||
shExpMatch(host,"www.aviationnow.com") ||
shExpMatch(host,"horttech.ashspublications.org") ||
shExpMatch(host,"apt.allenpress.com") ||
shExpMatch(host,"jas.fass.org") ||
shExpMatch(host,"*.dukejournals.org") ||
shExpMatch(host,"www.journalhydraulicresearch.com") ||
shExpMatch(host,"www.ajcp.com") ||
shExpMatch(host,"www.wipsglobal.com") ||
shExpMatch(host,"lion.chadwyck.co.uk") ||
shExpMatch(host,"www.avs.org") ||
shExpMatch(host,"spiedigitallibrary.aip.org") ||
shExpMatch(host,"asmedl.aip.org") ||
shExpMatch(host,"www.imaging.org") ||
shExpMatch(host,"hanchi.ihp.sinica.edu.tw") ||
shExpMatch(host,"enterprise.astm.org") ||
shExpMatch(host,"edo.tw") ||
isInNet(host,"211.20.11.205","255.255.255.255") ||
isInNet(host,"203.73.116.138","255.255.255.255") ||
isInNet(host,"163.29.141.191","255.255.255.255") ||
isInNet(host,"192.192.58.96","255.255.255.255") ||
isInNet(host,"61.218.52.75","255.255.255.255") ||
isInNet(host,"203.85.10.214","255.255.255.255") ||
isInNet(host,"203.70.141.50","255.255.255.255") ||
isInNet(host,"140.120.80.21","255.255.255.255") ||
isInNet(host,"140.120.80.2","255.255.255.255") ||
isInNet(host,"140.120.81.240","255.255.255.255") ||
isInNet(host,"204.179.122.*","255.255.255.255") ||
isInNet(host,"72.164.152.*","255.255.255.255") ||
isInNet(host,"211.21.109.118","255.255.255.255") ||
shExpMatch(host,"*.epnet.com") ||
shExpMatch(host,"*.ebscohost.com") ||
shExpMatch(host,"*.acm.org") ||
shExpMatch(host,"cancerres.aacrjournals.org") ||
shExpMatch(host,"udndata.com") ||
shExpMatch(host,"www.fasebj.org") ||
shExpMatch(host,"dbonline.igroupnet.com") ||
shExpMatch(host,"journals.cambridge.org") ||
shExpMatch(host,"jcs.biologists.org") ||
shExpMatch(host,"ejournals.ebsco.com") ||
shExpMatch(host,"jcl.sagepub.com") ||
shExpMatch(host,"www.oxfordreference.com") ||
shExpMatch(host,"www.oxford-digitalreference.com") ||
shExpMatch(host,"www.oxfordscholarship.com") ||
shExpMatch(host,"www.oed.com") ||
shExpMatch(host,"www.groveart.com") ||
shExpMatch(host,"www.grovemusic.com") ||
shExpMatch(host,"www.oxforddnb.com") ||
shExpMatch(host,"www.oxfordaasc.com") ||
shExpMatch(host,"ildc.oxfordlawreports.com") ||
shExpMatch(host,"pao.chadwyck.co.uk") ||
shExpMatch(host,"infoweb.newsbank.com") ||
shExpMatch(host,"siamdl.aip.org") ||
shExpMatch(host,"www.pnas.org")
)
return "DIRECT";

else if (url.substring(0, 5) == "http:")
return "PROXY cache.nchu.edu.tw:3128; DIRECT";

else
return "DIRECT";
}
else {
return "EIRECT";
}
}

大致如此，按照自己的需求修改，應該就沒問題了，Squid各版本的設定應該大同小異。
自己也曾在系上Switch出問題時，透過Hinet備援線路連回系上進行維護，少跑了一趟。

Ubuntu Server Edition 8.10 (Intrepid Ibex)

Ubuntu Server Edition 8.10 (Intrepid Ibex)將在今天發佈，來Chcck一下What's New吧！

DKMS

DKMS (by Dell) is included in Ubuntu 8.10, allowing kernel drivers to be automatically rebuilt when new kernels are released. This makes it possible for kernel package updates to be made available immediately without waiting for rebuilds of driver packages, and without third-party driver packages becoming out of date when installing these kernel updates.

以後在Linux上安裝硬體就不需要再手動重編Kernel載入驅動程式了，DMKS會幫你搞定。

Samba 3.2

A lot of new features have been added in Samba 3.2, including:

• clustered file server support
• encrypted network transport
• IPv6
• better integration with current Microsoft Windows™ clients and servers.

很重要的是支援Clustered File Server。看第四項的意思應該是針對AD的部份做加強，SMB 2.0的部份應該是不會在Samba 3.x支援。

Exploring the SMB2 protocol介紹了SMB 2.0 Protocol。因為Header與opcode全部都與SMB 1.0不同，我想是因為這個原因，Samba才決定在Samba 4.0之後才會支援SMB 2.0。

Clustered File Server的部份可以參考這個Presentation。目前應該是類似MS DFS，不過未來目標則是希望能做到File Level的Clusetering。

python-vm-builder
This is a complete rewrite of ubuntu-vm-builder featuring a better template system, a plugin architecture allowing support for other distributions, front-ends and additional functionalities such as post install task (--exec, --copy) or first boot (--first-boot, --first-login). It provides a compatibility mode with the previous command-line syntax and adds better reporting.

Python-vm-builder allows you to create a new virtual machine in a few minutes without going through the interactive installation process. It can be very useful for developers, software vendors or system administrators. A tutorial is available at https://help.ubuntu.com/community/JeOSVMBuilder

JeOSVMBuilder是一個前端程式，可以幫使用者建立一個Ready to use的Virtual Machine。

JeOS is now an option in the server installer
In an effort to simplify our build process and avoid confusion when trying to install JeOS on real hardware, JeOS is no longer provided as a separate ISO. Instead, it is an option that is activated on the server installer by pressing F4 on the first screen and selecting the "Install a minimal virtual machine" option.

JeOS將整併進ubuntu Server中成為一個安裝選項。

ACARD ANS-9010, 硬體Ramdisk的優劣分析

ACARD ANS-9010，從第一次發佈就讓人很感興趣也引起許多爭議的產品。

八條DIMM，最多能支援到64G的DDRII w/o ECC Memory
內建鋰電池及CF備份用插槽
兩組SATA II，可利用RAID 0更進一步提昇速度

這樣的產品，最令人非議的莫過於他的價格高達$12,000了！
不過說他貴其實也還好，因為他有八條DIMM，i-Ram要兩組才能達到相同的容量。

ANS-9010最大的優勢在於他是使用SATA作為介面，雖然說速度上來說不若PCI-E來的快，
但是擴充性夠高，比較容易達成高容量的Ramdisk系統(ex:1TB)。

也因為使用SATA，整體的效能頻寬會卡在磁碟陣列卡之上，磁碟陣列卡的選擇會非常顯著的影響Ramdisk的效能。


相較於目前最熱門的SSD，Ramdisk的優勢在於隨機讀取寫入的效能、壽命以及資料正確性。
缺點則當然是價格高昂與資料揮發性。

如果有看過SSD的測速報告，會發現SSD在寫入的效能非常的低落，隨機寫入的效能更是低的可怕。且大量的寫入會造成SSD壽命的急遽下降。SSD的ECC偵錯機制以及NAND Flash的隨機毀損問題更讓資料可靠性比Ramdisk來的差。

這種在隨機寫入有最佳性能的硬體，最適合的應用環境應是Cache！
拿來作大型資料庫或者是大型網站的cache能夠大量的節省頻寬以及系統運算能量。


不過OC的評測似乎沒有把ANS-9010的優點展現出來，只測讀取的部份，Ramdisk的效能根本沒有被彰顯，OC的編輯實在是很糟糕。