A few questions re: installing 10g on a virtual linux machine

I am in the process of building up a virtual linux box on my XP laptop and have a few questions regarding the networking setup. Purpose is to have a sandbox *nix setup at my fingertips. 
Here's what I have so far:
Dell Latitude laptop running Win XP. This is a DHCP machine.
Installed VMWare Player
Created virtual machine with OEL 4.8, with NAT network config
So far, so good. Next step is to install 10.2.0.4 EE on the virtual Linux machine. When installing 10.2.0.4 directly on the XP system, of course I had to install a loopback adapter to provide a fixed IP address for Oracle, all well documented in the installation guide. While it is my understanding that the loopback adapter, as installed and configured on Windows, is primarily a Windows issue, I would expect something of the same fundamental under Linux insomuch as it is still a dhcp machine. However, when checking the relevant installation guide, the section on networking considerations and DHCP simply gave a two-paragraph discussion of what DHCP was. I found no discussion on how to deal with it in a *nix environment.
This particular vmware setup gives me a choice of 3 network configs - Bridged , NAT, or host-only (private vitrual net shared only with the host) I am currently configured to use NAT because I need outside connectivity (to yum server, etc) but do not want an additional device (ip address) on the real network. I'm guessing I could use host-only most of the time and when I need to access the internet, shut down the db and switch back to NAT.
This is all new territory for me, so I guess I'm looking at some 'best practices' advice as much as anything.

Ed,
I would encourage going for OEL 5u2 or 5u3 and including the oracle-validated package. It makes sure you have all the prerequisites for 10gR2 and makes life much easier.
I set up dozens of these machines for Oracle U classes. What I started with originally is 2 virtual NIC - a NAT and a Bridged. The Bridged allowed me to access the outside world at any time and was assigned using DHCP from the local network. The NAT I'd configure manually as a static IP, and I used it primarily to provide a second 'virtual network' so the classroom machines could communicate with each other.
In my latest iteration, I've dropped back to a single Bridged NIC based on DHCP. For Oracle install purposes, I
- pick a hostname (myhost.oraclass.com)
- switch to static IP (I've scripted it - edits /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/syscfg/network : hostname) but using the network GUI tool is ok as well
- I choose the static to macth the DHCP address assigned
- inject a single line into the /etc/hosts with the new static address, the hostname, and a hostname that I want to publish
192.168.4.21 myhost.oraclass.com orahost student21.oraclass.com student21
- set a global env variable (/etc/profile.d/oraprofile.sh (export HOSTNAME=myhost.oraclass.com)
and after installing Oracle, I switch back to DHCP. Then if I want to travel, I can easily switch the 'static' address as often as I want (also scripted) to match the IP addr the 'host DHCP' provides.
I've used the NAT. It hands out a DHCP address and usually it works for me (and Oracle) simply by making it static (as above) and letting VMWare container handle it. But every once in a while it seems to 'jam up' and I'd need to fight with it. So I've converted to bridged .. with the help of some scripts I've written.

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    3. I can access 'http://chen_rong/apex/apex_admin' in IE6, but after input admin/password , I can not be redirected into administation page, because the cookie was blocked by IE6.
    then, the first question is :
    Q1: What is the difference among 'http://chen_rong' , 'http://localhost' , 'http://192.168.88.175' ? I have already include site 'chen_rong' into my trusted stes! why the cookie was blocked by IE6. I have already tried firefox and google browser, both of them were ok for 'chen_rong', no cookie blocked from site 'chen_rong'!
    and,
    1. I have tried to use the script in attachment to test http authentication and also want to catch the cookie by utl_http .
    2. please review the script for me.
    3. I did:
    SQL> exec show_url('http://localhost/apex/apex_admin/','ADMIN','Passw0rd');
    HTTP response status code: 401
    HTTP response reason phrase: Unauthorized
    Please supplied the required Basic authentication username/password for realm XDB for the Web page.
    Web page http://localhost/apex/apex_admin/ is protected.
    MS-Author-Via: DAV
    DAV: 1,2,<http://www.oracle.com/xdb/webdav/props>
    Server: Oracle XML DB/Oracle Database
    WWW-Authenticate: Basic realm="XDB"
    Date: Tue, 04 Aug 2009 02:25:15 GMT
    Content-Type: text/html; charset=GBK
    Content-Length: 147
    ======================================
    PL/SQL procedure successfully completed
    4. I also did :
    SQL> exec show_url('http://localhost/apex/apex_admin/','ANONYMOUS','ANONYMOUS');
    HTTP response status code: 500
    HTTP response reason phrase: Internal Server Error
    Check if the Web site is up.
    PL/SQL procedure successfully completed
    SQL> exec show_url('http://localhost/apex/apex_admin/','SYSTEM','apexsite');
    HTTP response status code: 401
    HTTP response reason phrase: Unauthorized
    Please supplied the required Basic authentication username/password for realm APEX for the Web page.
    Web page http://localhost/apex/apex_admin/ is protected.
    Content-Type: text/html
    Content-Length: 147
    WWW-Authenticate: Basic realm="APEX"
    ======================================
    PL/SQL procedure successfully completed
    my second questions is :
    Q2: After I entered into realm 'XDB', I still need went into realm'APEX'. how could I change the script show_url to accomplish these two tasks and successfully get the cookie from site.
    the show_url script is as following:
    CREATE OR REPLACE PROCEDURE show_url
    (url IN VARCHAR2,
    username IN VARCHAR2 DEFAULT NULL,
    password IN VARCHAR2 DEFAULT NULL)
    AS
    req UTL_HTTP.REQ;
    resp UTL_HTTP.RESP;
    name VARCHAR2(256);
    value VARCHAR2(1024);
    data VARCHAR2(255);
    my_scheme VARCHAR2(256);
    my_realm VARCHAR2(256);
    my_proxy BOOLEAN;
    cookies UTL_HTTP.COOKIE_TABLE;
    secure VARCHAR2(1);
    BEGIN
    -- When going through a firewall, pass requests through this host.
    -- Specify sites inside the firewall that don't need the proxy host.
    -- UTL_HTTP.SET_PROXY('proxy.example.com', 'corp.example.com');
    -- Ask UTL_HTTP not to raise an exception for 4xx and 5xx status codes,
    -- rather than just returning the text of the error page.
    UTL_HTTP.SET_RESPONSE_ERROR_CHECK(FALSE);
    -- Begin retrieving this Web page.
    req := UTL_HTTP.BEGIN_REQUEST(url);
    -- Identify yourself.
    -- Some sites serve special pages for particular browsers.
    UTL_HTTP.SET_HEADER(req, 'User-Agent', 'Mozilla/4.0');
    -- Specify user ID and password for pages that require them.
    IF (username IS NOT NULL) THEN
    UTL_HTTP.SET_AUTHENTICATION(req, username, password, 'Basic', false);
    END IF;
    -- Start receiving the HTML text.
    resp := UTL_HTTP.GET_RESPONSE(req);
    -- Show status codes and reason phrase of response.
    DBMS_OUTPUT.PUT_LINE('HTTP response status code: ' || resp.status_code);
    DBMS_OUTPUT.PUT_LINE
    ('HTTP response reason phrase: ' || resp.reason_phrase);
    -- Look for client-side error and report it.
    IF (resp.status_code >= 400) AND (resp.status_code <= 499) THEN
    -- Detect whether page is password protected
    -- and you didn't supply the right authorization.
    IF (resp.status_code = UTL_HTTP.HTTP_UNAUTHORIZED) THEN
    UTL_HTTP.GET_AUTHENTICATION(resp, my_scheme, my_realm, my_proxy);
    IF (my_proxy) THEN
    DBMS_OUTPUT.PUT_LINE('Web proxy server is protected.');
    DBMS_OUTPUT.PUT('Please supply the required ' || my_scheme ||
    ' authentication username/password for realm ' || my_realm ||
    ' for the proxy server.');
    ELSE
    DBMS_OUTPUT.PUT_LINE('Please supplied the required ' || my_scheme ||
    ' authentication username/password for realm ' || my_realm ||
    ' for the Web page.');
    DBMS_OUTPUT.PUT_LINE('Web page ' || url || ' is protected.');
    END IF;
    ELSE
    DBMS_OUTPUT.PUT_LINE('Check the URL.');
    END IF;
    -- UTL_HTTP.END_RESPONSE(resp);
    -- RETURN;
    -- Look for server-side error and report it.
    ELSIF (resp.status_code >= 500) AND (resp.status_code <= 599) THEN
    DBMS_OUTPUT.PUT_LINE('Check if the Web site is up.');
    UTL_HTTP.END_RESPONSE(resp);
    RETURN;
    END IF;
    -- HTTP header lines contain information about cookies, character sets,
    -- and other data that client and server can use to customize each
    -- session.
    FOR i IN 1..UTL_HTTP.GET_HEADER_COUNT(resp) LOOP
    UTL_HTTP.GET_HEADER(resp, i, name, value);
    DBMS_OUTPUT.PUT_LINE(name || ': ' || value);
    END LOOP;
    -- Read lines until none are left and an exception is raised.
    --LOOP
    -- UTL_HTTP.READ_LINE(resp, value);
    -- DBMS_OUTPUT.PUT_LINE(value);
    --END LOOP;
    UTL_HTTP.GET_COOKIES(cookies);
    dbms_output.put_line('======================================');
    FOR i in 1..cookies.count LOOP
    IF (cookies(i).secure) THEN
    secure := 'Y';
    ELSE
    secure := 'N';
    END IF;
    -- INSERT INTO my_cookies
    -- VALUES (my_session_id, cookies(i).name, cookies(i).value,
    -- cookies(i).domain,
    -- cookies(i).expire, cookies(i).path, secure, cookies(i).version);
    dbms_output.put_line('site:'||url);
    dbms_output.put_line('cookies:');
    dbms_output.put_line('name:'||cookies(i).name);
    dbms_output.put_line('value:'||cookies(i).value);
    dbms_output.put_line('domain:'||cookies(i).domain);
    dbms_output.put_line('expire:'||cookies(i).expire);
    dbms_output.put_line('path:'||cookies(i).path);
    dbms_output.put_line('secure:'||secure);
    dbms_output.put_line('version:'||cookies(i).version);
    END LOOP;
    UTL_HTTP.END_RESPONSE(resp);
    EXCEPTION
    WHEN UTL_HTTP.END_OF_BODY THEN
    UTL_HTTP.END_RESPONSE(resp);
    END;
    /

    I use oracle database enterprise edtion 10.2.0.3. I have already figured out the epg on 10.2.0.3 to support apex 3.2.
    And as I described above, the apex site works fine for ip address , and localhost. but the cookie will be blocked by IE6, if I want to access the site by 'http://computername:port/apex/apex_admin'. This problem does not occured in firefox and google browser. Could someone give me answer?

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