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Hi,
I have simple network topology
Inet -> PPPOE -> OPNsense -> admin pc (192.168.1.1)
Inet -> PPPOE -> OPNsense -> user pc (192.168.2.1)
First time after installation, I have assigned and configured the network interfaces with IP addresses as above. No other firewall rules or packages installed yet. WAN is also not connected.
I find that as soon as I connect the web browser to point to the opnsense URL from a browser, the ARP connectivity fails.
I have checked ping before launching the browser, that works
I have checked arp output and it is all good (see below)
I have checked curl output and that is good too.
But right after I launch the browser to connect to the device the connectivity fails.
Why is this problem happening?
---------------------------------------------------------------------------------------------------------
I connect to the admin pc to open the web gui:
test ping to 192.168.1.1 succeeds
C:\Users\Localuser>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
2) ARP check
C:\Users\Localuser>arp -a
Interface: 192.168.1.100 --- 0xa
Internet Address Physical Address Type
192.168.1.100-e0-4c-68-00-c1 dynamic
192.168.1.255ff-ff-ff-ff-ff-ff static
224.0.0.2201-00-5e-00-00-16 static
224.0.0.25101-00-5e-00-00-fb static
224.0.0.25201-00-5e-00-00-fc static
255.255.255.255ff-ff-ff-ff-ff-ff static
3) CURL check
C:\Users\Localuser>curl http://192.168.1.1
<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="robots" content="noindex, nofollow" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta name="copyright" content="" />
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
<meta name="mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>Login | OPNsense</title>
--------------> snip <---------------------------------------------------------
4) NOW, I open a web browser and hit http://192.168.1.1 page fails to open
5) Wireshark logs show continuous ARP requests for 192.168.1.1
6) I check ARP
Interface: 192.168.1.100 --- 0xa
Internet Address Physical Address Type
192.168.1.255ff-ff-ff-ff-ff-ff static
224.0.0.2201-00-5e-00-00-16 static
224.0.0.25101-00-5e-00-00-fb static
224.0.0.25201-00-5e-00-00-fc static
255.255.255.255ff-ff-ff-ff-ff-ff static
There is a surprising entry for 192.168.1.255 which points to ff-ff-ff-ff-ff and same is repeated for 255.255.255.255
I have simple network topology
Inet -> PPPOE -> OPNsense -> admin pc (192.168.1.1)
Inet -> PPPOE -> OPNsense -> user pc (192.168.2.1)
First time after installation, I have assigned and configured the network interfaces with IP addresses as above. No other firewall rules or packages installed yet. WAN is also not connected.
I find that as soon as I connect the web browser to point to the opnsense URL from a browser, the ARP connectivity fails.
I have checked ping before launching the browser, that works
I have checked arp output and it is all good (see below)
I have checked curl output and that is good too.
But right after I launch the browser to connect to the device the connectivity fails.
Why is this problem happening?
---------------------------------------------------------------------------------------------------------
I connect to the admin pc to open the web gui:
test ping to 192.168.1.1 succeeds
C:\Users\Localuser>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
2) ARP check
C:\Users\Localuser>arp -a
Interface: 192.168.1.100 --- 0xa
Internet Address Physical Address Type
192.168.1.100-e0-4c-68-00-c1 dynamic
192.168.1.255ff-ff-ff-ff-ff-ff static
224.0.0.2201-00-5e-00-00-16 static
224.0.0.25101-00-5e-00-00-fb static
224.0.0.25201-00-5e-00-00-fc static
255.255.255.255ff-ff-ff-ff-ff-ff static
3) CURL check
C:\Users\Localuser>curl http://192.168.1.1
<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="robots" content="noindex, nofollow" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta name="copyright" content="" />
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
<meta name="mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>Login | OPNsense</title>
--------------> snip <---------------------------------------------------------
4) NOW, I open a web browser and hit http://192.168.1.1 page fails to open
5) Wireshark logs show continuous ARP requests for 192.168.1.1
6) I check ARP
Interface: 192.168.1.100 --- 0xa
Internet Address Physical Address Type
192.168.1.255ff-ff-ff-ff-ff-ff static
224.0.0.2201-00-5e-00-00-16 static
224.0.0.25101-00-5e-00-00-fb static
224.0.0.25201-00-5e-00-00-fc static
255.255.255.255ff-ff-ff-ff-ff-ff static
There is a surprising entry for 192.168.1.255 which points to ff-ff-ff-ff-ff and same is repeated for 255.255.255.255
