## Picard group of the moduli space of semistable rank 2 parabolic vector bundles over smooth complex projective curves with trivial determinant

I am looking for the Picard group of the moduli space of semistable rank 2 parabolic vector bundles over smooth complex projective curves with trivial determinant.

Having determinant trivial, I believe we can consider the bundles as parabolic $$SL(n,\mathbb{C})$$-bundles as well. The closest result have found in this regard is a paper by Laszlo and Sorger, ‘The Picard group of the moduli of G-bundles on a curve’, but they only talk about quasi-parabolic bundles rather than parabolic bundles.

My question is: Is the picard group known already? Does anyone know of any reference? I need it urgently if possible. Any help would be appreciable.

## How can I make sure ping traffic over ipsec is going outside?

I’ve got a VPN tunnel (ipsec / StrongSwan) setup, connected. The other side is apparently able to ping me through the tunnel. However a ping from my side is said to be never received on the other side. The other side (that I cannot control) is thus assuming it’s a configuration issue from my side.

I’m really not sure about this, because I can see the ping packets going out when tcpdumping:

``\$   ping -c 5 192.168.33.1 PING 192.168.33.1 (192.168.33.1) 56(84) bytes of data. --- 192.168.33.1 ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 4009ms  (at the same time in another console) \$   tcpdump host REMOTE 09:22:07.539582 IP LOCAL > REMOTE: ESP(spi=0xXXXXXX,seq=0x3), length 132 09:22:08.547608 IP LOCAL > REMOTE: ESP(spi=0xXXXXXX,seq=0x4), length 132 (... one packet per ping ...) ``

The ESP traffic is obviously my ping. To make sure I’ve disabled all firewalling from my side.

Thus my question: How can I make sure the ping packets are going out and received? What can be the cause and what can I do more to help debug the issue?

As a side note, I’ve got another VPN setup and working, using the exact same configuration.

## Time Machine over network drive when I am on a different network

I am trying to back up my Mac to a drive attached to my home Wi-Fi network while I am at school connected to a different network, but the backups only seem to work when I’m at home connected to the same network my drive is attached to.

I was reading that is was possible to back up from any wireless network, but I am not sure how to set this up.

## Can I intercept and impersonate a server over an HTTP wireless connection?

Let’s assume I have a strong enough antenna at exactly the same frequency as the victim. If it sends a request over unprotected http to the router, could I then listen to that request and respond to it before the router does? Would I need the MAC address of the victim too?

## Route all traffic over Fiber VLAN

Recently, I upgraded to fiber based internet, that works okay but I want to hook that up directly to my Ubuntu box instead of the supplied router. The problem is, even though I can get a valid IP via DHCP for the network interface, nothing is routed through there. Ie, I get an IP, but all networks are unreachable.

I know I am supposed to get the IP on VLAN 300. And that works. But, the configured network doesn’t.

This is the interface file;

``auto enp5s0 iface enp1s0 inet manual  auto enp5s0.300 iface enp1s0f0.5 inet dhcp  auto br0 iface br0 inet manual bridge_ports enp5s0.300 bridge_stp off  ``

In the log I do see the dhcp server handing me an IP, but after that, I can’t ping the IP of that dhcp server for instance. Nor any other ip then my own. I feel like I am missing something trivial here, but can’t really put my finger on it.

## Basic buffer overflow able to over EIP but doesn’t correctly overwrite when using memory address

I wrote a basic vulnerable app in C.

``#include <string.h> ``

void vuln(char *arg) { char buffer[10]; strcpy(buffer, arg); }

int main( int argc, char** argv ) { vuln(argv[1]); return 0; }

I determined that if I input 26 characters, characters 23-26 will overwrite EIP. I can successfully represent this in gdb. When try to replace some arbitrary character with my desired address (the address to system() in libc 0xb7e41b40 on my machine) eip becomes gibberish. The input ends up being “a * 22 \x40\x1b\xe4\xb7” why is that? I pasted the gdb output below as well. Thank you.

``(gdb) run aaaaaaaaaaaaaaaaaabbbb\x40\x1b\xe4\xb7 ``

The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /home/bob/Documents/C/Disassembler_Fun/overflow aaaaaaaaaaaaaaaaaabbbb\x40\x1b\xe4\xb7

Program received signal SIGSEGV, Segmentation fault. 0x78303478 in ?? () (gdb) i r eax 0xbffff276 -1073745290 ecx 0xbffff520 -1073744608 edx 0xbffff28a -1073745270 ebx 0x61616161 1633771873 esp 0xbffff290 0xbffff290 ebp 0x62626262 0x62626262 esi 0x2 2 edi 0xb7fbb000 -1208242176

why not the address? eip 0x78303478 0x78303478 didn’t work?

eflags 0x10282 [ SF IF RF ] cs 0x73 115 ss 0x7b 123 ds 0x7b 123 es 0x7b 123 fs 0x0 0 gs 0x33 51 (gdb) run aaaaaaaaaaaaaaaaaabbbbcccc The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /home/bob/Documents/C/Disassembler_Fun/overflow aaaaaaaaaaaaaaaaaabbbbcccc

Program received signal SIGSEGV, Segmentation fault. 0x63636363 in ?? () (gdb) i r eax 0xbffff286 -1073745274 ecx 0xbffff520 -1073744608 edx 0xbffff292 -1073745262 ebx 0x61616161 1633771873 esp 0xbffff2a0 0xbffff2a0 ebp 0x62626262 0x62626262 esi 0x2 2 edi 0xb7fbb000 -1208242176

over written with cccc eip 0x63636363 0x63636363 worked here

eflags 0x10282 [ SF IF RF ] cs 0x73 115 ss 0x7b 123 ds 0x7b 123 es 0x7b 123 fs 0x0 0 gs 0x33 51 (gdb)

## Requirements to stay over in Dubai while transit?/

My Flight is on 25th June 2019 and I’m travelling from Guatemala to India but i want to stay in Dubai to visit my Cousins over there and back to India.

I’m a Indian Citizen

Do we get visa on arrival or we need to travel with the visa??

Because my friends travelled through Dubai and stayed over there for 15days and they got on arrival visa and just to confirm before booking the Tickets.

## Taking over a project. Should I scrap and rebuild? [on hold]

I’m taking over an Opencart solution for a client. This is for my capstone at College. I’m to create a simple CRM (Customer Relationship Management) software that will live as a single page application in the site.

Opencart is a free, open-source e-commerce platform based on the LAMP stack.

Currently, the client’s site is live, but it is not a store, and will never be a store. They have 5 registered users. The site just has content, and little functionality.

Should I convince the Client to scrap and rebuild what he has?

I have some concern with the current solution because it seems to be far too complex for the needs of the project.

Thanks for any insight.

## Split cart rules/discount over multiple lines

I am trying to work out where or how I can get the discounts/cart rules to be applied across multiple lines

eg Current Display

Subtotal: \$ xxx.xx

Discount (Free Shipping, Applied Coupon Code WELCOME10, Spend more, get more) -\$ xx.xx

Preferred Display

Subtotal: \$ xxx.xx

Discount(Free Shipping) -\$ xx.xx

Discount(Spend more, get more) -\$ xx.xx

Discount(Coupon: WELCOME10) -\$ xx.xx

I can see something around Discounts in here, about being an array but not sure how to explode it

``<item name="discount" xsi:type="array">                                                            <item name="component" xsi:type="string">Magento_SalesRule/js/view/cart/totals/discount</item>                                                            <item name="config" xsi:type="array">                                                                 <item name="title" xsi:type="string" translate="true">Discount</item>                                                            </item>                                                         </item> ``

## P2P over proxy?

User U1 uses a peer-to-peer chat client that lets him connect to user U2 and initiate a chat session. The client creates an endpoint by binding U1’s public IP address to some port and then generates a string which U1 can share with U2 via some other means (WhatsApp or whatever). The string basically encodes U1’s IP address and port, which U2 can pass to the same chat client so that it can decode IP and port details out of that string and make a connection request to U1. Upon U1’s confirmation, a session is successfully created.

My question:

a) Is the idea anywhere close to how peer-to-peer clients and libraries (like jitsi) work?

b) What if all the traffic to and from U1’s client is (SOCKS) proxied and U2 gets the IP address of the proxy server instead? The connection request from U2 fails right? How real world clients/libraries deal with (or avoid) such issues?